单项选择题

You'd better ______ the doctor earlier.

A．to see
B．seeing
C．having seen
D．go to see
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单项选择题
It was not until the accident happened ______ .
A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my own folly
D．that I became aware of my own foolishness
单项选择题
I happened ______ when the telephone rang.
A．rut
B．to be out
C．being out
D．be out
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