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20．---You do have the book I've been looking forward to？
---Ha，sure．I ____ if I didn't．（　�。�

	A．	would never have called		B．	hadn't called
	C．	won't call		D．	wouldn't be calling

分析 -你真有我一直想要的那本書嗎？
-哈哈，當然．如果沒有，我就不會打電話了．

解答答案：D
句意表達的是對現在事實的相反假設，要用虛擬；對現在事實的相反假設，從句用一般過去時態，主句用情態動詞加動詞原形，表示對現在情況的相反假設．故選D．

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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