单项选择题

He is so shy that he() speaks in the public.

A. often
B. frequently
C. seldom
D. sometimes

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单项选择题
In countries where a solar calendar was adopted, the length of each year need to be () in order to have the same number of months in each year.

A. changed
B. altered
C. transformed
D. modified
单项选择题
Had he worked harder, he () the exams.

A. must have got through
B. would have got through
C. would get through
D. could get through
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