阿摩線上測驗
12. Researchers have been _______the benefits and harms of drinking coffee by conducting experiments related to the stomach.
(A) requesting
(B) perceiving
(C) witnessing
(D) investigating
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統計： A(1), B(3), C(0), D(15), E(0) #3356758
統計： A(1), B(3), C(0), D(15), E(0) #3356758
