单项选择题

I'm moving to the countryside because the air there is much fresher than () in the city.

A．ones
B．one
C．that
D．those

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单项选择题
The woman biologist stayed in Africa studying wild animals for 13 years before she returned. Oh, dear! She() a lot of difficulties!

A．may go through
B．might go through
C．ought to have gone through
D．must have gone through
单项选择题
Peter () TV with Tom this time yesterday.

A．was watching
B．watched
C．were watching
D．had watching
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