The problem was so complicated that Mr. Smith had to______his brains.

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问题 The problem was so complicated that Mr. Smith had to______his brains.

选项 A、crack
B、check
C、rack
D、block

答案C

解析 本题考固定搭配。rack one’s brains"绞尽脑汁",所以C为正确答案;crack"破裂,砸开,发出爆炸声";check"检查,核对";block"阻塞,封锁"。
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