单项选择题

At no time ______ what was happening.

A．the President was aware of
B．the President was aware about
C．was the President aware of
D．was the President aware on
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单项选择题
The clock ______ and we realized it was two o'clock.
A．hit
B．struck
C．knocked
D．rang
单项选择题
Suddenly he heard someone ______ gently on the window.
A．knock
B．knocking
C．knocked
D．to knock
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