16. If we had taken 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

16.   B考查錯綜時間的虛擬語氣。，據(jù)從句的謂語had taken effective measures可知，從句表示與過去事實相反，因此條件從句用過去完成時。根據(jù)時間now可知，主句與現(xiàn)在的事實相反，所以用"would+動詞原形"的形式。故選B。

題目來源：2015全品語法快練高中英語新課標 > 訓練23 情態(tài)動詞和虛擬語氣

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