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
-- ______ of his parents liked pop music. -- So they did. It is noisy.
A．All
B．None
C．Both
D．Neither
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