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

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(dāng)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。
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