单项选择题

-- Hello, is that Mrs Black speaking
-- Yes, who's that
-- ______ Mary.

A．I'm
B．That's
C．She's
D．This is
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单项选择题
Our teacher never ______ us leave class early.
A．lets
B．allows
C．make
D．tells
单项选择题
Only if you work hard every day ______ pass the exam.
A．you can
B．may you
C．you must
D．must you
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