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【单选题】
After all preparations were made, the plane took off.A.
一切准备工作就绪以后，飞机就起飞了。
B.
一切准备以后，飞机就起飞了。
C.
一切准备工作以后，飞机就起飞了。
D.
准备工作就绪以后，飞机就起飞了。
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