单项选择题

I hadn"t seen him for years, but I ______ his voice on the telephone.

A．realized
B．discovered
C．recognized
D．heard
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单项选择题
The assistant and graduate student ______ check the exercise books.
A．help
B．helping
C．helps
D．to help
单项选择题
I decided to go to the party as soon as I ______.
A．would finish what I was doing
B．finish what I did
C．finished what I did
D．finished what I was doing
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