单项选择题

To understand （） wars continue to go on when nearly everyone wants to have peace, we must look into the nature of war.

A．why
B．whether
C．if
D．that

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单项选择题
The teacher （） waiting for finally came into the classroom.

A．who has been
B．we had been
C．who are
D．who we
单项选择题
January 1 is New Year's Day, （） many people look forward to the next year.

A．while
B．that
C．which
D．when
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