|作者：300li 文章來源：本站原創 點擊數： 更新時間：2009/5/11||
__________ your address，I would have written to you.
A. Did I know B. Were I to know
C. Had I known D. If I should know
此題應選 C。這是虛擬語氣的倒裝形式。當虛擬條件句中含有 were，had，should，could等動詞時，可以將if省略，然后將 were，had，should，could 等詞移至句首：
1. If he should fail，he would kill himself.
→Should he fail，he would kill himself.
2. If I were you，I would do it at once.
→Were I you，I would do it at once.
3. If I could do it，I would.
→Could I do it，I would.
4. If he had seen you yesterday，he would haveasked you about it.
→Had he seen you yesterday，he would haveasked you about it.
If he had money，he would buy a car.
→Had he money，he would buy a car.
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