单项选择题

You ______ yesterday if you were really serious about the job.

A．ought to come
B．ought have come
C．ought come
D．ought to have come
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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
单项选择题
Our teacher never ______ us leave class early.
A．lets
B．allows
C．make
D．tells
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