单项选择题

（） the room, I saw my teacher talking with my parents.

A．Entering
B．Having entered
C．Entered
D．Being entered

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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

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

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