2. 外语
  3. If farmers______so much of the prairie, the dust storms of the 1930s would not have been so severe.

If farmers______so much of the prairie, the dust storms of the 1930s would not have been so severe.

admin2019-07-01  28
问题 If farmers______so much of the prairie, the dust storms of the 1930s would not have been so severe.
选项 A、do not plow
B、have not plowed
C、had not plowed
D、will not plow
答案C
解析 In this past unreal conditional sentence, had not plowed is the correct verb form in the condition clause.
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