作业帮Helen_____go on the trip with us,but she isn' t quite sure yet.选项：A.shall B.must C.may D.can
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Helen_____go on the trip with us,but she isn' t quite sure yet.选项：A.shall B.must C.may D.can
Helen_____go on the trip with us,but she isn' t quite sure yet.
选项：A.shall B.must C.may D.can
Helen_____go on the trip with us,but she isn' t quite sure yet.选项：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.
may 从后面那句推断。 表式推测的语气由强到弱分别为 must can may
may
选C
根据语意此处应填“可能”