Be careful when you cross this busy street. ________, you may get run over by a car. 
A．If notB．If soC．If any D．If possible
A

試題分析：考查省略。句意：當(dāng)你穿過(guò)這條繁忙的街道時(shí)要小心。如果不小心的話，你可能會(huì)被汽車撞到。當(dāng)if從句的主語(yǔ)跟主句主語(yǔ)一致，且謂語(yǔ)是be的某種形式時(shí)，if從句常省略主語(yǔ)和be動(dòng)詞。這里的if not相當(dāng)于if you are not，故選A。
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