阿摩線上測驗
15.
(A) Had it not been for the establishment of a causal link
(B) Should a causal link be established
(C) Were it not for the establishment of a causal link
(D) If a causal link should have been established
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統計： A(8), B(23), C(18), D(18), E(0) #3125358
統計： A(8), B(23), C(18), D(18), E(0) #3125358
