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【题目】Read the instructions before ________ the new machine.

A. use B. to use C. using D. used

【答案】C

【解析】句意:使用新机器前请阅读说明书。A. use动词,使用;B. to use动词不定式,使用; C. using动名词,使用;D. used动词过去式或过去分词,使用。before介词,在...之前,其后跟名词/代词/v-ing。所以本题使用using。故选:C。

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