The computer teacher was talking with its students as if it______a human teacher.

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问题 The computer teacher was talking with its students as if it______a human teacher.

选项 A、is
B、had been
C、was
D、were

答案D

解析该题是语法结构题，考查虚拟语气的用法。当虚拟语气用在as if引导的方式状语从句中时，如果从句中的动词与主句的动词同时发生，该动词用过去式。如果从句中的动词表示的动作先于主句的动词发生，该动词用had+动词过去分词。该句子主句中使用的是过去进行时态，as if后面的从句里的动词似乎该用选项B那样的形式。但是，该从句的谓语动词是表示状态的系动词be，在此处用其过去式就行了，此外虚拟语气要用were，不能用was。因此，根据题意和语法规则，选项D为最佳答案。

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专业英语四级

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