题目内容

Helen ______ go on the trip with us, but she isn’t quite sure yet.
A．shallB．mustC．mayD．can
C
may也许，口气不肯定，另外后句的she isn’t puite sure yet.已给出暗示。shall用在陈述句中与第二、三人称连用表示允诺，命令等。must:必须can:能够，也可表“推测”但常用于否定句。
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