题目内容

Helen ____ go on the trip with us, but she isn’t quite sure yet.
A．shallB．mustC．mayD．can
C

试题分析：考查情态动词用法。Shall表示将来时，或者表示命令，警告，强制，要求；must一定，必定；may也许，表示可能性较小；can可能；may的可能性较小。句意：Helen也许会和我们一起去旅游，但是她不敢确定。根据句意说明C正确。
点评：Shall表示将来时，或者表示命令，警告，强制，要求；must一定，必定；may也许，表示可能性较小；can可能；may的可能性较小。
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