单项选择题

I ______ writing the article by the time you get back.

A．shall finish
B．must have finished
C．have finished
D．shall have finished
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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
单项选择题
On reaching the top floor I suddenly realized that I ______ my book on the service desk.
A．leaves
B．left
C．had left
D．was left
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