题目内容

根据给定资料3—7的内容，请简要概述地沟油能存在于市场上的原因。要求：紧扣给定材料，全面准确，条理性强，不超过200字。

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The pen ______ he is writing is mine.

A. with which
B. in which
C. on which
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______ was said have must be kept secret.

A. Whatever
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C. Yes, she was
D. Yes, she wasn’t

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A. What; that
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C. That; why
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