阿摩線上測驗
13. Teacher: When _________? Student: In 1928.
(A) was penicillin discovered
(B) did penicillin discover
(C) penicillin has discovered
(D) discovered penicillin
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統計： A(261), B(35), C(13), D(4), E(0) #888158
統計： A(261), B(35), C(13), D(4), E(0) #888158
