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20．-Excuse me，visiting hours are over．It's time for you to leave．
-I'm sorry，I didn't know the time or I ______ earlier．（　　）

A．

will leave

B．

would leave

C．

had left

D．

would have left

分析 -對不起，參觀時間已到，你該走了．
-不好意思，我不知道時間到了．要不然我會早點(diǎn)離開的．

解答答案：D
句意表達(dá)的是相反假設(shè)，要用虛擬結(jié)構(gòu)；句中or相當(dāng)于一個條件句if I had known the time；句意表達(dá)的是對過去事實(shí)的相反假設(shè)，主語要用情態(tài)動詞加完成時態(tài)．故選D．

點(diǎn)評 虛擬語氣是表示與事實(shí)相反的假設(shè)，構(gòu)成方式有：對現(xiàn)在或?qū)恚瑮l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(xué)習(xí)時，要牢記構(gòu)成方式．

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