单项选择题

______ we made adequate preparation, the party would have been a success.

A．Had
B．If
C．If only
D．Because
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If the ships were the most ______ sink, they are rated as A1 by insurance companies.
A．able to
B．capable of
C．unlikely to
D．impossible of
单项选择题
I didn't know ______ or stay here.
A．either to go
B．whether to go
C．if to go
D．if that I should go
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