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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The police are______ the traffic accident that happened yesterday.
A．looking down upon
B．looking forward to
C．looking into
D．looking after
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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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