单项选择题

—The light in the office is still on. —Oh, I forgot______.

A．turning it off
B．turn it off
C．to turn it off
D．having turned it off
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单项选择题
—I'm sorry to keep you waiting. —Oh, not al all. I ______here only a few minutes.
A．have been
B．had been
C．was
D．will be
单项选择题
Shirley ______ a book about China last year, but I don't know whether she has finished it.
A．has written
B．wrote
C．had written
D．was writing
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