11．You _____ drive fast when there is a heavy rain．（　�。�
A．mustB．mustn'tC．needD．have to

分析 下大雨時(shí)，你不能開快車．

解答 答案：B．考查情態(tài)動(dòng)詞．句意"下大雨時(shí)，你不能開快車．"must、need、have to都表示肯定的意思，mustn't表示禁止．根據(jù)題意當(dāng)下大雨時(shí)，應(yīng)該是不能開快車，表示否定的意思，故選B．

點(diǎn)評(píng) 了解情態(tài)動(dòng)詞意思及用法，再結(jié)合句意進(jìn)行選擇．

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