单项选择题

Scientists first ______ the idea of the atomic bomb in the 1930s.

A．perceived
B．conceived
C．deceived
D．retrieved
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单项选择题
______ today, he would get there by Saturday.
A．Was he leaving
B．Would he leave
C．If he leaves
D．Were he to leave
单项选择题
With the introduction of the electronic computer, there is no complicated problem can be solved in a few hours.
A．but
B．which
C．that
D．what
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