20．Constant quarrels between my parents are driving me crazy．If only I           a warm and harmonious family．（　�。�
A．haveB．will haveC．hadD．had had

分析 和父母不斷的爭吵讓我快瘋了．要是我有一個溫暖和睦的家庭該多好啊．

解答 答案：C  特殊虛擬句，if only…要是怎樣該多好啊，表示與事實相反的假設，句式虛擬的一種；題干表達的是對現(xiàn)在情況的相反假設，條件句中要用一般過去時態(tài)．故選C．

點評 虛擬語氣是表示與事實相反的假設，構(gòu)成方式有：對現(xiàn)在或?qū)�，條件句中用一般過去時態(tài)，主語用情態(tài)動詞加動詞原形；對過去，條件句中用過去完成時態(tài)，主語用情態(tài)動詞加完成時態(tài)．學習時，要牢記構(gòu)成方式．

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