.Four-fifths of the crop .A. are ruinedB. was ruinedC. were ruinedD. have been ruined

问题补充：

.Four-fifths of the crop .

A. are ruined

B. was ruined

C. were ruined

D. have been ruined

答案：

A. are ruined

(答案→)B. was ruined

C. were ruined

D. have been ruined

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