I would appreciate ___ you could give me some advice on lear

I would appreciate ___ you could give me some advice on learning English.
A it whether B it if c that when D that if
为什么?选A为什么不对,

wehter意思是　是否
if 除有　是否　意思外,还有　如果　的意思
这句话是　如果你能在学英语上给我一些建议,我将很感激．
所以用if,选B
再问： it 是形式宾语吧？
再答： 是的，代替后面的if you could give me some advice on learning English． ~~~~~~~~~~~~~~~~~~~~~祝你进步，有疑问可追问，请及时采纳~~~~~~~~~~~~~~~~~~~~