单项选择题

He is the boy （） I went swimming yesterday.

A. who
B. whom
C. with whom

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单项选择题

（） of them are famous doctors, but （） of them has been to Britain.

A. Both...both
B. Neither...neither
C. Both...neither

单项选择题

There are （） seasons in a year in our country.

A. two
B. four
C. second

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