四级考试语法真题训练时态2_大学英语单词

　　28.Great as Newton was, many of his ideas______ today and are being modified by the work of

　　scientists of our time.

　　A. are to challenge B. may be challenged C. have been challenged D. are challenging

　　29.It seems oil______ from this pipe for some time. We ll have to take the machine apart to put it

　　right.

　　A. had leaked B. is leaking C. leaked D. has been leaking

　　30.Once environmental damage ______, it takes many years for the system to recover.

　　A. has done B. is to do C. does D. is done

　　31.Neither of the young men who had applied for a position in the university ______.

　　A. has been accepted B. have been accepted C. was accepted D. were accepted

　　32.The last half of the nineteenth century______ the steady improvement in the means of travel.

　　A. has witnessed B. was witnessed C. witnessed D. is witnessed

　　33.If she doesn t tell him the truth now, he ll simply keep on asking her until she ______.

　　A. does B. has done C. will do D. would do

　　34.My train arrives in New York at eight o clock tonight. The plane I would like to take from there_______ by then.

　　A. would leave B. will have left C. has left D. had left

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