单项选择题

The boy dived into the water and after ______ seemed to be a long time, he came up again.

A．what
B．that
C．it
D．which
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单项选择题
______ of them knew about the draft plan because it was kept a secret
A．Each
B．None
C．All
D．No one
单项选择题
It's a long time since he left his hometown, ______
A．didn't he
B．hadn't he
C．wasn't it
D．isn't it
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