单项选择题

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

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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
单项选择题
-- Don't stop trying. -- (). Success is coming.

A.Yes, we don't
B.Yes, we'll try our best
C.No, of course not
D.No, you can't
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