________ was unknown to us, he always said, was how the teacher knew the secret.[ ]A．ItB．WhatC．ThatD．As-高中英语-n多题

◎ 题干

______ was unknown to us, he always said, was how the teacher knew the secret.

A. It
B. What
C. That
D. As

◎ 答案

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◎ 解析

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◎ 知识点

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