四级考试语法真题训练时态2_大学英语单词

　　21.While people may refer to television for up-to-the-minute news, it is unlikely that

　　television______ the newspaper completely.

　　A. will replace B. have replaced C. replace D. replaced

　　22.The fifth generation computers, with artificial intelligence, _______ and perfected now.

　　A. developed B. have developed C. are being developed D. will have been developed

　　23.It s reported that by the end of this month the output of cement in the factory_______ by about

　　10%.

　　A. will have risen B. has risen C. will be rising D. has been rising

　　24.Sir Dennis, who is 78, has made it known that much of his collection ______ to the nation.

　　A. has left B. is to leave C. leaves D. is to be left

　　25.Before the first nonstop flight made in 1949, it_______ necessary for all planes to land for

　　refueling.

　　A. would be B. has been C. had been D. would have been

　　26.Until then, his family ______ from him for six months.

　　A. didn t hear B. hasn t been hearing C. hasn t heard D. hadn t heard

　　27.The conference_______ a full week by the time it ends.

　　A. must have lasted B. will have lasted C. would last D. has lasted

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