Question

I'd appreciate      if you would turn the radio down．

A．that

B．it

C．this

D．you

Answer 1

B

考查形式宾语。it是形式宾语，真正的宾语是if you would turn the radio down。因为appreciate在此处是及物动词，后面必须加宾语，就用it充当形式宾语。