His______brain has worked away on the idea of the foundation.A、richB、quickC、pr

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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“丰富的”；quick“机智的，聪明的”；productive“丰饶的，肥沃的”；fertile“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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