单项选择题

When checking in，you need to show your ticket and （）。

A.import
B.export
C.passport
D.transport

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单项选择题
Only when we landed（）how badly the plane had been damaged.

A.we realized
B.did we realize
C.had we realized
D.we had realized
单项选择题
When the orphan came back to life，he found himself （）by many warm－hearted people.

A.to be surrounded
B.having surrounded
C.surrounded
D.surrounding
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