The United States Department of Labor (enforces) laws that (promote) the welfare of wage earners, (improving) occupational condi

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问题 The United States Department of Labor (enforces) laws that (promote) the welfare of wage earners, (improving) occupational conditions and (advance) employment opportunities.

选项 A、enforces
B、promote
C、improving
D、advance

答案C

解析 应为improve,与promote、advance并列。
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