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This street is very crowded at this time of day.You have to be very cautious while ______.

A.to drive B.being driven C.driving D.having driven

 

C

【解析】

試題分析:句意:街上這個時候很擁擠,開車的時候,你要小心。這里使用了時間狀語從句的省略,完整的是:You have to be very cautious while you are driving.當主從句的主語一致的時候,可以省略從句的主語和be動詞,所以選C。

考點:考查狀語從句的省略式

 

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