The old man ____(whom/that)teaches chemistry in a college is a professor.

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The old man ____(whom/that)teaches chemistry in a college is a professor.
The old man ____(whom/that)teaches chemistry in a college is a professor.

The old man ____(whom/that)teaches chemistry in a college is a professor.
whom(用于人)

that
whom用于宾语。主语应用who. 这里的that没什么意思,就是补充说明而已。

that,
whom用于人,做宾语
that可用于人和物,可做主语,宾语
teaches chemistry in a college is a professor前缺少主语,不能用whom,用that