【題目】If we had taken such effective measures much earlier, the river___ soseriously now.

A. is not polluted B. would not be polluted

C. had not been polluted D. would not have been polluted

【答案】B

【解析】選B　句意：如果我們早采取有力措施，現(xiàn)在河水就不會污染這么嚴(yán)重。主句表示與現(xiàn)在事實相反的虛擬語氣，用would加動詞原形。

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