His______brain has worked away on the idea of the foundation.

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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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