一道英语语法选择题（请进！请详细说明！谢谢！）
Theymanagedtofortifytheseawallbeforethestorm______.AhadbrokenBbrokeCbrokeoutDhadbroke...
They managed to fortify the sea wall before the storm ______.
A had broken B broke C broke out D had broken out 展开
A had broken B broke C broke out D had broken out 展开
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选择B。
break：（查美国传统字典）
To come forth or begin from a state of latency; come into being or emerge:
出现，显现：从隐伏的状态中显露出来；形成或出现：
A storm was breaking over Miami. Crocuses broke from the soil.
迈阿密上空暴风雨大作。藏红花破土而出
Break out：一般指战争，疾病等的爆发。
另外，时态，前面用了过去时（managed)，所以manage to fortify 比 break的动作还要早，因此用过去时。
break：（查美国传统字典）
To come forth or begin from a state of latency; come into being or emerge:
出现，显现：从隐伏的状态中显露出来；形成或出现：
A storm was breaking over Miami. Crocuses broke from the soil.
迈阿密上空暴风雨大作。藏红花破土而出
Break out：一般指战争，疾病等的爆发。
另外，时态，前面用了过去时（managed)，所以manage to fortify 比 break的动作还要早，因此用过去时。
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