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
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—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
单项选择题
What is probably the time for the appointment().

A. 7:40.
B. 7:30.
C. 7:00.
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