是cut down it还是cut it down

是cut down it还是cut it down cut it down是什么意思 cut it up 还是 cut up it cut it 砍伐树木是用cut 还是cut down Trees are very important.We can't cut thenm down B cut it down C cut down themD cut down it cut it in half ,cut it into half,cut it into halves 哪个是正确的 砍伐树木用cut还是cut down cut up it 和 cut it up 是cut off,cut up,cut donw还是cut away 是cut down the forests 还是 cut down forests?是use the wood 还是use wood? cut it out! cut it out cut it a little cut down Cut down cut down ? Here is the mutton .pleaseA.cup it up B.cup up it C.cup it down D .cut down it 最好是讲一下