单项选择题

I （） to the radio when you rang the bell the first time.

A．listened
B．had listened
C．had been listening
D．was listening

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单项选择题
I missed the last bus. I could do nothing but （） in the village for the night.

A．to stay
B．stay
C．staying
D．stayed
单项选择题
There are many kinds of metals, （）.

A. all having its special properties
B. each having its special properties
C. one has its special properties
D. each has its special properties
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