Just then we had an important piece of work in hand, the generator that supplies the power to the whole works broke ______.

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问题 Just then we had an important piece of work in hand, the generator that supplies the power to the whole works broke ______.

选项 A、out
B、up
C、off
D、down

答案D

解析 broke down意为“(指机器)损坏,发生故障”。A.broke out意为“突然发生,爆发”;B.broke up意为“分开,分解”;C.broke off意为“中止,中断”。
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