GMAT prep语法笔记!GMAT考试中，对于语法知识的考察也是比较多的。因此在平时的备考中，大家还是要重点关注GMAT的语法内容。具体的大家可以多了解一些GMAT的语法笔记。下面小编为大家整理了详细的内容，供大家参考!
The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.
A. that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding B. that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding C. that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has
expanded
D. the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is
expanding
E. the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding
句子结构： The … theory holds that the universe began in … and has been…
考点：
1. 主系表结构中表语是对主语的描述、说明，因此要搭配合理。
选项分析：
A. Correct;10 to 20 billion years ago做定语修饰instant B. Had began时态错误，begin是即时动词不能用完成时态，而且只是描述过去某个时间点的事件，不需要
用完成时;第二个had应该改为has，因为至今仍在扩大，应该用现在时态 C. 句子仿佛在说the beginning of the universe在10 to 20 billion years ago是一个instant，而后来就不是一
个instant了，逻辑上不正确;that has expanded修饰instant错误
D. the beginning of the universe to have been的表达wordy;hold … to have been表达不如宾语从句直接，
而且wordy，只有knowned to have done这种不得已的时候才用这样的结构;that is expanding将原句中并列的句子改为从句，改变了原句意思;is expanding时态错误，应用现在完成进行时与ever since搭配 E. had been expanding与holds并列错误，begin逻辑上应该与expand并列;hold…to have begun的表达不
如宾语从句直接
OG12-8的解释：
Logical predication; Verb form
The sentence describes the central tenet of a theory about how the universe began. The focus of the second clause should be consistently on the subject the universe, and all verbs in the clause beginning with that must describe what the universe did at the initial explosive moment.
A. Correct. Both verbs in the second clause correctly take universe as their subject.
B. Had begun is the wrong tense because it describes action that occurred farther in the past than some
other, specifi ed past action.
C. The relative clause that has expanded describes instant, which makes no sense.
D. The beginning of the universe to have been … is unnecessarily indirect and wordy; illogically suggests
that beginning is expanding, not the universe.
E. The verb phrases to have begun and has been expanding both reference the same subject of the
clause, universe, and therefore need to be parallel.
下划线的两个句子并不矛盾，因为that从句前面的beginning be an instant是主系表结构，所以that从句describe的是instant和beginning.
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