问题描述：
关于shall 提问一个很简单英语选择题
Shall we go hiking this Saturday?
——sorry,l＿＿, l will have to take a piano lesson
A.may not B.can‘t
为什么选B,不选A?
Shall we go hiking this Saturday?
——sorry,l＿＿, l will have to take a piano lesson
A.may not B.can‘t
为什么选B,不选A?
问题解答：
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