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  3. Most environmental problems exist because adequate measures for preventing them ______ taken in the past.

Most environmental problems exist because adequate measures for preventing them ______ taken in the past.

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问题 Most environmental problems exist because adequate measures for preventing them ______  taken in the past.
选项 A、was not
B、were not being
C、were not
D、was no to be
答案C
解析 句中有in the past，故用一般过去时态。从句主语为复数，故选C项。
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