题目内容
5.-Listen!Helen is singing in the classroom.-It ________ be Helen.She didn't come to school because she had a cold.( )
| A. | mustn't | B. | may not | C. | can't | D. | should |
分析 --听!海伦正在教室里唱歌.
--不可能是海伦.因为她感冒了,没有来学校.
解答 答案:C.
mustn't禁止;may not不可以;can't不可能;should应该.根据She didn't come to school because she had a cold,可知不可能是海伦,因为她感冒了,没有来学校.can't不可能,表示猜测.故选C.
点评 本题考查了情态动词的用法.解答时注意区分辨别句意以及所给选项的意思.
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