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.專心于……。類似結(jié)構(gòu)的近義短語為：put one’s heart into專心致志于……，該句意為：她因工作不用心，而犯了一個愚蠢的錯誤。
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