60% of the population of the town ______ workers; things are different now.

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问题 60% of the population of the town ______ workers; things are different now.

选项 A、is
B、are
C、was
D、were

答案D

解析 这个小镇60%的人口过去都是工人,现在不同了。60%的人口为复数,和现在相比较,前半句说的是过去。故本题答案为D。
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