单项选择题

He has made another discovery, () of great importance to science.

A．which I think it is
B．of which I think it is
C．which I think is
D．I think which is

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单项选择题
--Who are you going to have this letter () for you --My secretary.

A．type
B．typed
C．been typed
D．been typing
单项选择题
The women carrying babies come in first, ()

A．will you
B．will they
C．do you
D．don't you
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