单项选择题

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

A．I saw
B．I have seen
C．have I seen
D．do I see
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单项选择题
—How about having dinner at Sun Restaurant—It _______good.
A．smells
B．looks
C．sounds
D．appears
单项选择题
The old man has two daughters, _______are doctors.
A．both of them
B．both of whom
C．both who
D．they both
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