The proposal,________ I agree, is unfortunately not accepted by my partner, so I'm afraid you'll have to come up with another one.

A) that

B) which

C) to which

D) in that

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(C)

The proposal, to which I agree, is unfortunately not accepted by my partner, so I'm afraid you'll have to come up with another one.

=The proposal, which I agree to, is unfortunately not accepted by my partner.....

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agree 通常作不及物動詞,故不可直接接which作agree 的受詞,必須在which前加上to

The proposal, to which I agree, is unfortunately not accepted by my partner, so I'm afraid you'll have to come up with another one.

=The proposal, which I agree to, is unfortunately not accepted by my partner.....

*agree也可作及物動詞,但需接that所引導的名詞子句作受詞~

We all agree that these old-fashioned ideas won't work for youngsters.