单项选择题

She heard a continual strange noise coming from the next room, her heart _____ fast.

A．beat
B．beats
C．beating
D．beaten
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单项选择题
His fellow workers saw him fall down and blood came out from the open _____.
A．wound
B．injury
C．hurt
D．damage
单项选择题
He made another wonderful discovery, _____ of great importance to science.
A．which I think is
B．which I think it is
C．which I think it
D．I think is
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