The letter he looked forward to ___a.coming at last b.came at last为什么选B?look forward to doing不是吗

改错 he looked sad at the letter He looked t____ the letter and then went out The old man looked as_____as he could at the letter from his son and looked _____(care)用所给词的正确形式填空 Finally,the letter he looked forward to_______.A.come B.coming C.comeslooked forward to doing 选B吗 The letter I looked forward to received at last The letter he looked forward to ___a.coming at last b.came at last为什么选B?look forward to doing不是吗 并帮我分析一下其他的选项为什么错Henry always forgets things he has done.yesterday he forgot ___and looked for it everywhereA to post the letter B to have the letter posted C to have posted the letter D having posted the letter He looked sad because he failed ______(pass)the exams when he looked sadly at the picture.he looked sad 前面为什么用sadly不用sad? When he looked _____ at the picture ,he looked _______(sadly)为什么， He looked _________He looked ________(relax) while he was lying on the bed and watching TV. has he sent the letter?does he send the letter?did he send the letter?三句有何不同如何翻译 what does he say in the letter? the boy looked the sky,but he saw nothing 改错 He is the man who looked at the photo. The letter I looked forward to coming at last.改错,哪里错了? She looked forward to the letter which /that came at last.的主语是什么? 高中英语一题改错The letter I looked forward to received at last 怎么改,