【題目】______when you cross the road.
A.To care
B.Be careful
C.To be careful
D.Be care

【答案】B
【解析】句意是：當(dāng)你過(guò)馬路時(shí)要當(dāng)心。這是祈使句，以動(dòng)詞原形開(kāi)頭，故選B。

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