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 题目和参考答案——青夏教育精英家教网—

题目内容

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

【解析】

试题分析：句意：街上这个时候很拥挤，开车的时候，你要小心。这里使用了时间状语从句的省略，完整的是：You have to be very cautious while you are driving.当主从句的主语一致的时候，可以省略从句的主语和be动词，所以选C。

考点：考查状语从句的省略式

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