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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— Shall I get a birthday cake for Mary on my way back —Yes, it'll be nice if you（）

A. do
B. do invite
C. are
D. invited
单项选择题
The students were told to make （） study of the air situation in （） city of Beijing.

A. 不填; the
B. a; the
C. the; the
D. a; 不填
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