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
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
单项选择题
______the temperature, ______water turns into steam.
A．The high; the fast
B．Higher; faster
C．The more higher; the faster
D．The higher; the faster
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