37.
(A) improve
(B) improved
(C) improving
(D) to improve
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統計: A(2), B(16), C(30), D(8), E(0) #3861669
統計: A(2), B(16), C(30), D(8), E(0) #3861669
37.
(A) improve
(B) improved
(C) improving
(D) to improve