____ be careful when crossing the street!
A．MustB．ShouldC．Ought toD．Do
D                       
加強(qiáng)祈使句的語氣,不管動(dòng)詞是系動(dòng)詞還是行為動(dòng)詞,都在動(dòng)詞前加do。  
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