( )many laws of nature actually exist。
A.Not having been discovered
B.Having not been discovered
C.Not having discovered
D.Having not discovered
试卷相关题目
- 1The gas,if( )some air, burns rapidly。
A.mix
B.mixed with
C.mix with
D.mixing
开始考试点击查看答案 - 2Do you remember( )to Professor Smith during your last visit。
A.to have beenintroduced
B.having introduced
C.being introduced
D.to be introduced
开始考试点击查看答案 - 3She said in her letter that she’d appreciate( )from you soon。
A.to hearing
B.hearing
C.having heard
D.to hear
开始考试点击查看答案 - 4Accustomed to climbing trees,( )。
A.It wasnot difficult to reach the top
B.I had no difficulty reaching the top
C.the top was not difficult to reach
D.to reach the top was not difficult
开始考试点击查看答案 - 5Mr.Smith is not a fit person( )to supervise such a large office。
A.to weak out
B.to tun
C.to manage
D.to operate
开始考试点击查看答案 - 6I don't like my hair straight so I’m going to have it( )。
A.curling
B.curled
C.be curled
D.been curled
开始考试点击查看答案 - 7We have several books( )。
A.for your to choose from
B.for your choice
C.for the choice
D.for you to choose
开始考试点击查看答案 - 8( )three times in a now,the boxer decided to give up fighting。
A.Because having been defeated
B.Becausebe has been defeated
C.Having been defeated
D.Having defeated
开始考试点击查看答案 - 9It la reported that some( )countries are going to have a meeting next year。
A.oil produced
B.oil producing
C.producingoil
D.oil produce
开始考试点击查看答案 - 10Do you mind( )for an hour or two。
A.to wait
B.wait
C.be waiting
D.waiting
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