单项选择题

While Alen ______ TV, her father came home.

A． is watching
B． was watching
C． watches
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单项选择题
— Can I help you, sir — Yes. I bought this radio here yesterday, but it ______ .
A． didn't work
B． won't work
C． doesn't work
单项选择题
Excuse me. May I have a piece of ______.
A． water
B． knife
C． paper
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