单项选择题

What is Mary doing().

A. She is talking with her boyfriend.
B. She is working.
C. She is listening to music.

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单项选择题
—The book isn’t easy for Jack to understand, is it—______. His foreign language is far better than expected.
A. No, it isn’t

B. I’m afraid not
C. I don’t think so

D. Yes, it is
单项选择题
—The light in the office is still on. —Oh, ! forgot().

A. turning it off
B. turn it off
C. to turn it off
D. having turned it off
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