单项选择题

Mary () in bed all day because she had a fever.

A. lay
B. has laid
C. has lain
D. laid

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单项选择题
He is so shy that he() speaks in the public.

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