Question

【题目】By the time the fire-engine arrived, the fire by the inhabitants.
A.put out
B.had been put out
C.was put out
D.had put out

Answer 1

【答案】B
【解析】put out “扑灭”；by the time“到......末为止”，可以引导时间状语从句，加过去的事件，主句用过去完成时。句意：到消防车来的时候，火已经被居民扑灭了。故选B。