Question

If penicillin _____________ available, many people ______________ from sickness.

A．weren’t , would have died	B．shouldn’t be, would die
C．hadn’t been, would have died	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(dāng)和過去事實(shí)相反的似乎，條件狀語從句中使用過去完成時(shí)，主句中使用“情態(tài)動(dòng)詞+have done”。句意：如果沒有盤尼西林，很多人都會(huì)死于疾病。故C正確。
點(diǎn)評(píng)：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(shí)相反的情況，從句：If主語+過去時(shí)(Be動(dòng)詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實(shí)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(duì)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(dòng)詞過去式）/were ；主句：主語+should/would/could/might+do