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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Seldom () my boss in such a good mood since I came to work in this company.

A.I saw
B.have I seen
C.I have seen
D.do I see
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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