阿摩線上測驗
13. When the experiment failed, Dr. Smith realized that he _______ the chemicals incorrectly.
(A) mixes
(B) has mixed
(C) was mixed
(D) had mixed
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統計： A(8), B(17), C(14), D(134), E(0) #1836632
統計： A(8), B(17), C(14), D(134), E(0) #1836632
