Jack wasn't saying anything but the teacher smiled at him he had done something very clev

发布时间：2020-08-16 17:54:58

Jack wasn't saying anything but the teacher smiled at him      he had done something very clever.
　　A as if       B in case       C while         D though

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解析：本题考察状语从句的用法。根据句意，空格处需要填入好像，仿佛。故选A.
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