While crossing the street, _________．
- A.
the light must be green
- B.
there are no policemen
- C.
be careful
- D.
it is necessary to be careful
C
題意是“過(guò)大街時(shí)，一定要小心”。當(dāng)主句的主語(yǔ)和從句的主語(yǔ)相同時(shí)，從句可以改為引導(dǎo)詞加分詞形式，反過(guò)來(lái)，從句是引導(dǎo)詞加分詞形式，主句必須和從句保持主語(yǔ)一致。C項(xiàng)是祈使句，其主語(yǔ)是you。該句可改為You must be careful while you are crossing the street．
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