单项选择题

She had three daughters, all ______ became nurses.

A．of which
B．of whom
C．which
D．who
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单项选择题
Is this the air-conditioner you wish ______
A．to have repaired
B．to have repaired it
C．to have it repaired
D．to have been repaired
单项选择题
Did you have trouble ______ the swimming pool
A．to have found
B．to find
C．with
D．in finding
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