单项选择题

It was in 1961 ______ John F. Kennedy became president of the United States.

A．when
B．that
C．and
D．then
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单项选择题
I wish I ______ English fluently.
A．can speak
B．could speak
C．speak
D．may speak
单项选择题
TOFEL is for those ______ native language is not English.
A．that
B．of whom
C．which
D．whose
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