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---How did you work out the difficult chemistry problem?
--- I worked it out by ________.
A.working with a groupB.think very hard
C.ask the teacher for helpD.doing oneself
A

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。
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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