there is some rubbish on the grounp.Please __A pick them up B pick up themCpick it upDpick up it

问题描述:

there is some rubbish on the grounp.Please __A pick them up B pick up themCpick it upDpick up it

C something 看做第三人称单数,用it代替 C 地上有东西,请把它捡起来.