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

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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
单项选择题
The director ordered that the gate and windows （） firmly before leaving the office.

A.ought to be closed
B.be closed
C.shall be closed
D.must be closed
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