阿摩線上測驗
6.
(A) he co-invented the polygraph
(B) was co-inventing the polygraph
(C) the polygraph was co-invented
(D) who co-invented the polygraph
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統計： A(1), B(1), C(2), D(24), E(0) #2697902
統計： A(1), B(1), C(2), D(24), E(0) #2697902