2. 外语
  3. His______brain has worked away on the idea of the foundation.

His______brain has worked away on the idea of the foundation.

admin2017-03-25  17
问题 His______brain has worked away on the idea of the foundation.
选项 A、rich
B、quick
C、productive
D、fertile
答案B
解析 在给出的选项中：rich意为“丰富的”；quick意为“敏捷的，灵敏的”；productive意为“丰饶的，肥沃的”；fertile意为“肥沃的，多产的”。根据句意和各个选项的意思可知，正确答案是B。
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