单项选择题

I don't know whether it will rain or not, but if it rain, I shall stay at home（）

A．does
B．did
C．will
D．shall

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单项选择题

Never before（）made so great achievements in developing new technology of communication.

A．we have
B．did we
C．have we
D．do we

单项选择题

Supposing this ship（）, do you think there would be enough life jackets for ail the passengers

A．was sinking
B．has sunk
C．were to sink
D．sunk

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