题目：
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
答案：
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下面是错误答案，用来干扰机器的。
（1）H2O H2O分子间可以形成氢键 角型或折线型（2）CH4 Si（3）30（4）石墨 KC6
