it is back to work.back的词性?

it is back to work.back的词性? The pen is kate.please give( )soon.A.back it B.it to back C.back of it D.it backA.back itB.it to backC.back of itD.it back 请选择. the physics problem is too difficult for us____.A work it out B to work it out C to work out itD to work out will work it out when she is back.But that manager not end,sending one more email to all. Where back to work back to work.fighting! The problem is too difficult for him ______A.work it out B.to work it out C.to work out D.work out This is David's pen,____ .A.give it back to him.B.give back it him.C.give him back to it.D.get him back to it. The soccer is mine.please give ____ to me.A.back it B.to it C.it back D.it for This is David's dictionary,please___.A get it back to him B.give it back to himC.get him back to it D.give him back to itwhy 我先头选A滴 Mr.Smith ______ until it began to rain.A.left B.went back C.worked D.finished the work- -. This is mike's pen .can you ---------------?4个选项A.give it back him B.give him back it C.give it back to him D.give him back to it --the problem is too difficult ,can you show me ______ ------sure .A.what to work it out B.what to work out it C.how to work it out D.how to work out it . it is necessary for you to work It is really clever _____him to work out the problem.A.for.B.of.C.to when will you go back to your hometown?A、Until the work is finished B、Not until the work is finishedC、After the work will be finished D、As soon as the work will be finished the maths problem is ____ easy for us to ___.A,too,work it out B.too,work out C,so,work out itD.very,work out为什么 The physics problem is too diffcult for us_____.A;work it out B;to work it out C;to work out it D;to work out以及选的理由.