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This street is very crowded at this time of day.You have to be very cautious while ______.
A.to driveB.being driven C.driving D.having driven
C

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。
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