Question

If penicillin _____________ available, many people ______________ from sickness.

1. A.
   weren’t , would have died
2. B.
   shouldn’t be, would die
3. C.
   hadn’t been, would have died
4. D.
   is, will die

Answer 1

C
試題分析：考察虛擬語氣。本題考察的條件句的虛擬語氣。當和過去事實相反的似乎，條件狀語從句中使用過去完成時，主句中使用“情態(tài)動詞+have done”。句意：如果沒有盤尼西林，很多人都會死于疾病。故C正確。
考點：考察虛擬語氣
點評：if的虛擬語氣非常重要，簡要概括如下：1、表示與現(xiàn) 在事實相反的情況，從句：If主語+過去時(Be動詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實相反的情況，從句：If主語+had+done；主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，從句：①if+主語+were to do②if+主語+should+do ③if+主語+did（動詞過去式）/were ；主句：主語+should/would/could/might+do