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

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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

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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