The fire before the fire-fighters arrived.A. has been put outB. was put outC. had put out

问题补充：

The fire before the fire-fighters arrived.

A. has been put out

B. was put out

C. had put out

D. had been put out

答案：

A. has been put out

B. was put out

C. had put out

(答案→)D. had been put out

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