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In may require long period of mechanical ventilation for （）.

A.surviving
B.survival
C.survive
D.survived

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一I’m leaving for London tomorrow，Joss.一（）。

A.Take your time.
B.That’s it.
C.All the best!.
D.It doesn’t matter.

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To be immunized naturally exposes people（）potential complications.

A.in
B.on
C.at
D.to

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