John was fired by his factory and only then ________ how wrong he was to be lazy

John was fired by his factory and only then ________ how wrong he was to be lazy

题型:同步题难度:来源:
John was fired by his factory and only then ________ how wrong he was to be lazy and careless.[     ]
A. had he realized  
B. he had realized
C. did he realize  
D. he realized
答案
C
举一反三
Only when all the fish in the lake died ________ how serious the pollution was.[     ]
A. did the villagers realize  
B. the villagers realized
C. had the villagers realized  
D. the villagers had realized
题型:同步题难度:| 查看答案
Only by introducing scientific management, I suppose, ________ our company to a bright future and
make more profits in the next years.[    ]
A. can we bring  
B. we have brought
C. we can bring  
D. have we brought
题型:同步题难度:| 查看答案
Only when ________ be possible to sign the papers.[     ]
A. does the boss come will it
B. the boss comes will it
C. has the boss come it will
D. the boss comes it will
题型:同步题难度:| 查看答案
To our surprise, not a single word ________ in the discussion last Friday. [     ]
A. had the teacher said  
B. said the teacher
C. the teacher had said  
D. did the teacher say
题型:同步题难度:| 查看答案
______ allow drugs to become uncontrolled in our district. [      ]
A. In certain circumstances can we
B. In no circumstances we can
C. Under any circumstances we can
D. Under no circumstances can we
题型:同步题难度:| 查看答案
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