【題目】You ____drop litter into the sea.It is wrong.

A. canB. must

C. mustn't

【答案】C

【解析】

句意:你一定不能把垃圾扔進(jìn)河里,那是不對的。

根據(jù)drop litter into the sea.It is wrong可知是必須不能,表示禁止;can能,must必須,mustn't必須不能,禁止;故選C。

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