作业帮she looks very young.she ( )more than forty.A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案）
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she looks very young.she ( )more than forty.A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案）
she looks very young.she ( )more than forty.
A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案）
she looks very young.she ( )more than forty.A.must be B.can be C.can't be D.mustn't be （选择题）（选择最佳答案）
C can't be 表示推测 可能性
she looks only more than forty
用is at least
意思是：最少
答案：C.
翻译：她看起来非常年轻。她不可能超过40岁。
解释：
1. must be意思是“一定（超过40岁）”，和前句句意不符，排除；
2. can be意思是“可能（超过40岁）”，和前句句意也不符。而且can表示可能性很少用在肯定句中，除非表示事实上的可能性。
3. mustn't的意思是“不允许/禁止”，句意不通，排除；
4. 英语中表示“...
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答案：C.
翻译：她看起来非常年轻。她不可能超过40岁。
解释：
1. must be意思是“一定（超过40岁）”，和前句句意不符，排除；
2. can be意思是“可能（超过40岁）”，和前句句意也不符。而且can表示可能性很少用在肯定句中，除非表示事实上的可能性。
3. mustn't的意思是“不允许/禁止”，句意不通，排除；
4. 英语中表示“不可能”一般用can't，故C为正解。
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