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
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单项选择题
There ______ only a table, four chairs and a small bed in the room.
A．are
B．were
C．is
D．will be
单项选择题
Although he is short, ______ he is very strong.
A．yet
B．also
C．but
D．and
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