Question

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

1. A.
   that
2. B.
   it
3. C.
   this
4. 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。