单项选择题

There are several ______ to your plan.

A．alternatives
B．alternations
C．alternators
D．alternativeness
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单项选择题
Scientists first ______ the idea of the atomic bomb in the 1930s.
A．perceived
B．conceived
C．deceived
D．retrieved
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
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