[文法] the first antibiotic that discovered?

[superlulu (勇敢向前衝)]

Penicillin,________, kills a broad sectrum of bacteria, many of which cause

disease in humans.

A. the first antibiotic to be discovered

B. when the first antibiotic to be discovered

C. the first antibiotic that discovered

D. was the first antibiotic to be discovered

答案為A,為什麼C不行呢?

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