单项选择题

You haven't heard from John for a long time, ______ you

A． are
B． do
C． have
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单项选择题
Jim said he ______ the Great Wall before.
A． visited
B． had visited
C． has visited
单项选择题
It is so cold here. ______ I close the window
A． Must
B． Shall
C． Need
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