---How did you work out the difficult chemistry problem? --- I worked it out by . A．working with a group B．think very hard C．ask the teacher for help D．doing oneself 题目和参考答案——青夏教育精英家教网—

题目内容

---How did you work out the difficult chemistry problem?

--- I worked it out by ________.

A．working with a group B．think very hard

C．ask the teacher for help D．doing oneself

【答案】

【解析】

试题分析：句意：你是如何解决这个化学难题的？下文by是介词，表示通过某种方式，后面接名词或者动名词作宾语，选项A表示通过小组合作，选项D语义不符，结合语境可知选A。

考点：非谓语动词及短语辨析

点评：英语中原形动词一般只能用作句子的谓语，不能用作介词或者动词的宾语等句子成分。解答此题还需要了解各个短语的基本含义及用法的不同，同时注意其表示多个含义的现象，然后结合语境选择合适答案。

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