阿摩線上測驗
26.Columbus _______America in 1362, didn’t he?
(A)had discovered
(B)discovered
(C)was discovered
(D)has discovered
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統計： A(137), B(461), C(118), D(31), E(0) #340397
統計： A(137), B(461), C(118), D(31), E(0) #340397
