单项选择题

The professor of history is studying some major historical（）.

A、 incidents
B、 accidents
C、 events
D、 elements

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单项选择题
He recently（）a new habit of drinking tea at midnight.

A、 developing
B、 developed
C、 develop
D、 development
单项选择题
When he was at school, literature was one of the（）for them to learn.

A、 matters
B、 problems
C、 questions
D、 subjects
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