单项选择题

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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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
单项选择题
He failed the exam, () proved that he hadn't been working hard enough.

A．that
B．which
C．what
D．of which
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