问题描述：
_ than they started to work.A.No sooner they had got to the plant B.No sooner had they got to the
（ ）than they started to work.
A.No sooner they had got t the plant
B.No sooner had they got to the plant
C.As soon as they had got to the plant
（ ）than they started to work.
A.No sooner they had got t the plant
B.No sooner had they got to the plant
C.As soon as they had got to the plant
问题解答：
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