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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.
admin
2009-08-21
39
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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本试题收录于:
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