单项选择题

As I ______ down the street, I noticed a police car parking at the corner.
A) walked C) would walk
B) had walked D) was walking

A．As I ______ down the street, I noticed a police car parking at the corner.
B．walked
C．had walked
D．would walk
E．was walking
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单项选择题
If you carefully ______ the problem again, you will find a way out. A) think over C) set up B) take over D) look up
A．If you carefully ______ the problem again, you will find a way out.
B．think over
C．take over
D．set up
E．look up
单项选择题
The teacher told the class to ______ with their exercises while he was out of the classroom. A) go on C) look out B) break away D) take part
A．The teacher told the class to ______ with their exercises while he was out of the classroom.
B．go on
C．break away
D．look out
E．take part
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