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【题目】To battle world hunger, the great scientist once traveled to many places where populations _______ faster than crop production at that time.

A. expanded B. were expanding

C. has expanded D. would expand

【答案】A

【解析】

试题分析:考查时态。由once和at that time可知用过去时态,科学家去过的地方应该是指在当时那些地方的人口处于快速发展阶段,只是在那时的一般事实,故用一般过去时即可。句意:为了与世界饥荒作斗争,这位伟大的科学家曾经去过了许多当时人口发展速度远超过农作物生产速度的地方。故选A

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