单项选择题

______ a teacher in a university, it is necessary to have at least a Master’s degree.

A. To become B. Become
C. One becomes D. On becoming
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单项选择题
Tom ______ mathematics throughout his college life.
A. bored
B. bored with
C. was bored
D. was bored with
单项选择题
If the bad weather ______, the farmers will suffer great loss this year.
A. persists
B. insists
C. purchases
D. explores
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