If Fleming hadn't discovered penicillin, a lot of people from bacterial infection.
Awould be dead
Bwould have died正確答案
Cwould have survived
Dwould be saved
答案與詳解
If 子句用 hadn't discovered (過去完成),主要子句必須用 would have + p.p.。且語意上「若沒發明,很多人會死於感染」邏輯正確。
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