单项选择题


A．fun
B．work
C．learning
D．prize
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单项选择题
A．IfB．AlthoughC．BecauseD．Since
A．If
B．Although
C．Because
D．Since
单项选择题
There's little chance that mankind would _________ a nuclear war.
A．retain
B．maintain
C．endure
D．survive
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