单项选择题

I cannot tell the ______ difference between the twins.

A．slender
B．single
C．simple
D．slight
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单项选择题
I gave John a present but he gave me nothing ______.
A．in return
B．in turn
C．in advance
D．in vain
单项选择题
It is because she is very devoted to her students ______ she is respected by them.
A．that
B．which
C．what
D．who
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