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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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