She made a silly mistake because she hadn’t kept her       on her work.
A．headB．heart?C．brainD．mind
D
keep one’s mind on sth.專(zhuān)心于……。類(lèi)似結(jié)構(gòu)的近義短語(yǔ)為：put one’s heart into專(zhuān)心致志于……，該句意為：她因工作不用心，而犯了一個(gè)愚蠢的錯(cuò)誤。
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