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2.We _______ be careful when we're walking across the road.There're too many cars now.(  )
A.canB.mayC.mustD.could

分析 當我們走過馬路的時候必須要小心,現(xiàn)在的車輛太多了.

解答 答案:C.can能,會;may可以;must一定,必須;could能,會.根據There're too many cars now,可知現(xiàn)在的車輛太多了,所以過馬路的時候必須要小心.must一定,必須.故選C.

點評 本題考查了情態(tài)動詞的用法.熟知句意以及所給選項的意思是解答本題的關鍵.

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