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- 11A new technique _________ out, the yields (收成) increased by 20% .
A.having working
B.having been working
C.has worked
D.had been worked
开始考试练习点击查看答案 - 12You can't imagine what great trouble they have _____ the problem _____.
A.to solve; being talked about
B.solving; discussing
C.to solve; to talk about
D.solving; being discussed
开始考试练习点击查看答案 - 13We should prevent such a silly mistake _____ again.
A.occurring
B.to occur
C.to be occurred
D.from being occurred
开始考试练习点击查看答案 - 14Henry can't attend the party _____ at Tom's house at present because he is preparing the speech at the party _____ at Marie's house tomorrow.
A.held; being held
B.to be held; to be held
C.to be held; held
D.being held; to be held
开始考试练习点击查看答案 - 15Studies show the electronic devices people have made much use of _______ music may be causing hearing loss in many people.
A.enjoy
B.to enjoy
C.enjoying
D.enjoyed
开始考试练习点击查看答案 - 16The new machine,if _________ properly,will work at least ten years.
A.use
B.using
C.being used
D.used
开始考试练习点击查看答案 - 17There're so many kinds of tape-recorders on sale that I can't make up my mind _____ to buy.
A.what
B.which
C.how
D.where
开始考试练习点击查看答案 - 18 There is nothing more I can try _______ you to stay, so I wish you good luck.
A.being persuaded
B.persuading
C.to be persuaded
D.to persuade
开始考试练习点击查看答案 - 19_____ wherever you go is the price you pay for being famous.
A.Being recognized
B.To recognize
C.Recognizing
D.Having recognized
开始考试练习点击查看答案 - 20Anyone _____ bags, boxes, or whatever, was stopped by the police.
A.seen carry
B.seen carrying
C.saw to carry
D.saw carrying
开始考试练习点击查看答案
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