The problem was so complicated that Mr. Smith had to______his brains.A.crackB.checkC.rackD
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The problem was so complicated that Mr. Smith had to______his brains.
A.crack
B.check
C.rack
D.block
请帮忙给出正确答案和分析,谢谢!
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正确答案:C
本题考固定搭配。rackone’sbrains"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"。
