单项选择题

Some modern children's fiction deals with serious problems and situations with a realism seldom ______ in earlier books.

A．attempted
B．attempting
C．being attempted
D．having attempted
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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
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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