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14．If we had taken such effective measures much earlier，the fiver so seriously now．（　　）

	A．	is not polluted		B．	would not be polluted
	C．	had not been polluted		D．	would not have been polluted

分析如果我們早點采取這些有效措施，現在這條河就不會被嚴重污染了．

解答答案：B 題干表達與事實相反的假設，要用虛擬；主句表達的是對現在事實的相反假設，要用情態動詞加動詞原形來構成．故選B．

點評虛擬語氣是表示與事實相反的假設，構成方式有：對現在或將來，條件句中用一般過去時態，主語用情態動詞加動詞原形；對過去，條件句中用過去完成時態，主語用情態動詞加完成時態．學習時，要牢記構成方式．

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