单项选择题

_______ both sides accept the agreement _______ a lasting peace be established in this region.

A．Only if, will
B．if only, would
C．Should, will
D．Unless, would
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单项选择题
According to psychologists, a person's attention is attracted _______ by the intensity of different signals as by their context, significance, and information content.
A．much not so
B．not so much
C．so not much
D．so much not
单项选择题
_______ if I had arrived yesterday without letting you know beforehand
A．Would you be surprised
B．were you surprised
C．Had you been surprised
D．Would you have been surprised
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