Which of the following is different in meaning?A.Can you help me with the suitcase?B.Could you help me with the suitcase?C.Will you help me with the suitcase?D.Must you help me with the suitcase?
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D解析分析:请求对方做事情时可以用多种句型:Can you…?/Could you…?(此时could不表示过去,而是表示客气,在回答时不可以用could.)/Will you…?等,所以A,B,C都是请求对方做事情的句型,而D句中must表示的是“必须”,就是必要性的概念。