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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No sooner had she got home （）she tried on her new coat.

A. that
B. than
C. before
D. when
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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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