摘要：18．Not until all the fish died in the river how serious the problem of water pollution was. A．did they realize B．they did realize C．had they realized D．they had realized
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Not until all the fish died in the river ________ how serious the problem of water pollution was．
- A.did they realize
- B.they did realize
- C.had they realized
- D.they had realized
Not until all the fish died in the river _____ how serious the problem of water pollution was.
[ ]
A. did they realize
B. they did realize
C. had they realized
D. they had realized
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B. they did realize
C. had they realized
D. they had realized
Not until all the fish died in the river how serious the problem of water pollution was.
A. did they realize B. they did realize C. had they realized D. they had realized
查看习题详情和答案>>