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

______不分青红皂白，______是和亲______一律加以反对，______在封建时代还有什么更好的方法可以取得民族之间的和解呢
填入划横线部分最恰当的一项是( )。

A．因为 所以 就 可是
B．由于 因此 那 然而
C．倘若 倘若 就 那么
D．如果 只要 就 那么