One out of every ten persons in the 1978 United States labor force was a teenager, compared by one out of fifteen in 1960.

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问题 One out of every ten persons in the 1978 United States labor force was a teenager, compared by one out of fifteen in 1960.

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答案by—with

解析 译文:1978年,青少年占美国劳工的十分之一,而1960年这个比例是十五分之一。
分析:考查介词搭配。“与……相比较”用固定短语compare with,介词不用by。
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