单项选择题

It was not until then that I came to know knowledge ______ only from practice.

A．had come
B．has come
C．came
D．comes
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单项选择题
It's time he ______ something for his coming examination.
A．do
B．does
C．did
D．will do
单项选择题
I'm sure he understands ______ you feel. He's very clever.
A．when
B．what
C．whether
D．how
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