单项选择题

On reaching the top floor I suddenly realized that I _______my book on the service desk.

A．had forgotten
B．left
C．had left
D．was left
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单项选择题
—Don't stop trying.—________Success is coming.
A．Yes, we don't
B．Yes, we'll try our best
C．No, of course not
D．No, you can't
单项选择题
—________ of his parents liked pop music.—So they did. It is noisy.
A．All
B．None
C．Both
D．Neither
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