look forward to doing 为什么要用doing

look forward to doing 为什么要用doing look forward to doing. look forward to (doing )sth look forward to (doing) sth. 为什么spend+doing look forward to+doing like+doing like+to do look forward to和look forward to doing的区别 look forward to doing 还是to do? Look forward to doing and doing还是Look forward to doing and d look forward to do/ 还是 doing sth pay attention to doing和look forward to doing造句 look forward to doing和looking forward to do 英语：look forward to doing =expect to do