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请教各位老师，同学几道题，是从网上下的题 ，没有答案，不知道做的对不对，本人能力有限，可能错误很多，请大家指正，望朋友别见笑，诚心求解，谢谢！ 21. I had just started back for the house to change my clothes __ I heard voices. 过去完成时 A as B while C after D when 22. I felt somewhat disappointed and was about to leave, __ something occurred which attracted my attention. A unless B until C when D while 23. It was essential that these application forms __ back as early as possible. A must be sent B will be sent C are sent D be sent 24. The children went there to watch the iron tower __. A to erect B be erected C erecting D being erected 25. The engine __ smoke and steam. A gives up B gives in C gives away D gives off 26. The manager promised to keep me __ of how our business was going on. A to be informed B on informing C informed D informing 27. The goals __ he had fought all his life no longer seemed important to him. A after which B for which C with which D at which 28. I should like to rent a house, modern, comfortable and __ in a quiet neighborhood. A all in all B above all C after all D over all 29. __ we have finished the course, we shall start doing more revision work. A For now B Now that C Ever since D By now 30. What you have done is __ the doctor’s orders. A attached to B responsible to C resistant to D contrary to 本人答案：DBADD DBBDC
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