The problem was so complicated that Mr. Smith had to______his brains.A、crackB、c

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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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TheproblemwassocomplicatedthatMr.Smithhadto______hisbrains.A、crackB、c