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

（） nuclear weapons can be used on the battlefield, infantry soldiers (步兵) are permitted to spread out for even more protection.

A．But
B．When
C．Now that
D．Whereas

单项选择题

He went to a hospital and had his tooth （）.

A．being pulled
B．be pulled
C．to be pulled
D．pulled

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