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Helen ______ go on the trip with us,but she isn't quite sure

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Helen ______ go on the trip with us,but she isn't quite sure yet.
A.may B.can 选哪个 为什么?
Helen ______ go on the trip with us,but she isn't quite sure
A.shall B.must C.may D.can
情态动词表示推测时,must/may/might用于肯定(可能性逐渐递减);can/could用于否定和疑问(可能性逐渐递减);由此可排除A和D选项
由后面的but she isn' t quite sure yet.可以看出,她还不是十分确定.因此,排除B选项 选C.
译为:海伦可能和我们一起去旅行,但她还不是十分确定.