16. ______ more attention to learner variability, the study might not have overlooked the factors that ______ to differences in performance across groups.
(A)If it paid / contributed
(B)Had it paid / contributed
(C)Were it paying / have contributed
(D)Should it pay / had contributed
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統計: A(0), B(3), C(0), D(0), E(0) #3866630
統計: A(0), B(3), C(0), D(0), E(0) #3866630