问题补充：
No sooner in the distance a storm began to pour.
A. a thunder broke; when
B. a thunder had broken; than
C. had a thunder broken; than
D. did a thunder break; than
答案：
A. a thunder broke; when
B. a thunder had broken; than
(答案→)C. had a thunder broken; than
D. did a thunder break; than
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