单项选择题

In this advanced course, students are required to take performance tests at monthly（）

A．gaps
B．lengths
C．distances
D．intervals

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单项选择题
A news report is usually very short,（）when it is about something very important.

A．besides
B．except
C．apart from
D．except for
单项选择题
Nina（）back home if she had known that her husband would go to the bus stop to meet her.

A．couldn't have walked
B．shouldn't have walked
C．mustn't have walked
D．wouldn't have walked
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