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
—What about the book—Oh, very good. It's worth ________ a second time.
A．reading
B．being read
C．to read
D．to be read
单项选择题
When he was in the countryside, he_________visit the poor peasants.
A．used to
B．was used to
C．is used to
D．had used to
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