单项选择题

You should do（）investigations on this matter.

A．farther
B．much father
C．more father
D．further

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单项选择题
I felt somewhat disappointed and was about to leave（）something occurred which attracted my attention.

A．unless
B．until
C．when
D．while
单项选择题
Anyone who had been in your position（）the same.

A．had done
B．do
C．would have done
D．will do
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