题目

The work is too hard for him. He__________ finish it on time. A.     can't B. mustn't C. shouldn't D. needn't 答案：A 【解析】情态动词的考察 句意为“这工作对他来说太难。他不可能按时完成”。 can't 用在否定句中表示“不可能”； mustn't“绝对不能，禁止”； shouldn't “不应该”needn't“不必”

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