题目

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 答案：A解析：as if“好像；仿佛”；in case“以防”；while“而”；though“但是”。句意：杰克一句话也不说，而老师却向他微笑，仿佛他做了什么聪明的事。故选A项。

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