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Such a problem still exists because no adequate measures for preventing it _____ taken in the past.

题目简介

Such a problem still exists because no adequate measures for preventing it _____ taken in the past.

题目详情

Such a problem still exists because no adequate measures for preventing it _____ taken in the past.

A. are
B. had
C. were
D. had been.

题型：单选题难度：中档来源：专项题

答案

C

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