单项选择题

As I ______ down the street, I noticed a police car parking at the corner.

A．walked
B．had walked
C．would walk
D．was walking
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单项选择题
He ______ the news on the radio. You needn't go to tell him.
A．learns
B．had learned
C．is learning
D．has learned
单项选择题
I ______ something about him, but I do not know much.
A．told
B．had been told
C．have been told
D．have told
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