单项选择题

Nobody can explain the reason ______ the project was abandoned two years ago and then renewed earlier this year.

A．by which
B．why
C．which
D．how
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单项选择题
The singer receives an occasional letter from the young fan ______ he has set a good example.
A．who
B．that
C．for whom
D．to whom
单项选择题
I really appreciate ______ such comfortable shoes for me.
A．on your finding
B．you to find
C．for you to find
D．your finding
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