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
The old man has two sons, ______ are engineers.
A．both of them
B．both of whom
C．both who
D．they both
单项选择题
One third of the population here ______ Europeans.
A．are
B．is
C．was
D．is to be
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