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
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
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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