题目内容
【题目】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进河里，那是不对的。
根据drop litter into the sea.It is wrong可知是必须不能，表示禁止；can能，must必须，mustn't必须不能，禁止；故选C。
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题目内容
【题目】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进河里，那是不对的。
根据drop litter into the sea.It is wrong可知是必须不能，表示禁止；can能，must必须，mustn't必须不能，禁止；故选C。