Helen ______ go on the trip with us, but she isn’t quite sure yet.
A．shallB．mustC．mayD．can
C
may也許，口氣不肯定，另外后句的she isn’t puite sure yet.已給出暗示。shall用在陳述句中與第二、三人稱連用表示允諾，命令等。must:必須can:能夠，也可表“推測”但常用于否定句。
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