阿摩線上測驗
125 If the manager _____ about the delay earlier, he could have contacted the client.
(A) had known
(B) knows
(C) has known
(D) knowing
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統計： A(460), B(137), C(105), D(16), E(0) #3772633
統計： A(460), B(137), C(105), D(16), E(0) #3772633
