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
No sooner had she got home ______ she tried on her new coat.
A．that
B．than
C．before
D．when
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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