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

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