单项选择题

Not untillast______week the sad news．

A．that I knew
B．did I know
C．did I knew
D．that did I know
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单项选择题
______of the two books holds the opinion that the danger of nuclear war is increasing．
______of the two books holds the opinion that the danger of nuclear war is increasing．
单项选择题
The fact suggested that the situation______very serious at that moment．
A．was
B．were
C．should be
D．to be
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