I'll appreciate ____ if you do me the favor to send this message to Mr Allen.A thatB itC this D you

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I'll appreciate ____ if you do me the favor to send this message to Mr Allen.
A that
B it
C this
D you

I'll appreciate ____ if you do me the favor to send this message to Mr Allen.
选B
it这边指代的是后面整件事
【I'll appreciate it it.】是一个固定句型 意思为我会很感激如果...

B it 是形式宾语,真正的宾语是后面的宾语从句。

B