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题目
题型:不详难度:来源:
The research is so designed that once ____ nothing can be done to change it.  
A.beginsB.having begunC.beginningD.begun

答案
D
解析
此题也为省略句。连词once后省略了主语the search,从句“once begun”相当于“once the search is begun”。答案为D。
核心考点
试题【The research is so designed that once ____ nothing can be done to change it.  A.】;主要考察你对倒装句等知识点的理解。[详细]
举一反三
Never _____ time come back again.
A.has lostB.will loseC.will lostD.lose

题型:不详难度:| 查看答案
—He looks very hot and dry.
—So ____ if you had a temperature of 103.
A.would youB.will youC.would you have beenD.do you

题型:不详难度:| 查看答案
No.50 High School is as new as No.48 High School.____, it is more beautiful.
A.If anything B.If somethingC.If necessaryD.If so

题型:不详难度:| 查看答案
—He ought ot have been warned of the danger.
—____, but he wouldn’t listen to me.
A.yes, he ought toB.So he was
C.So was heD.So it was with him

题型:不详难度:| 查看答案
Only after reaching eighteen       join the army.
A.have you; you canB.have you; can you C.you have; you canD.you have; can you

题型:不详难度:| 查看答案
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