题干

If we had taken such effective measures much earlier, the river          so seriously now.

A:is not polluted

B:would not be polluted

C:had not been polluted

D:would not have been polluted

上一题 下一题 0.0难度 选择题 更新时间:2010-07-17 01:15:13

答案(点此获取答案解析)

B