阿摩線上測驗
13. The professor insisted that the students _____ their sources carefully before submitting the paper.
(A) check
(B) checked
(C) checking
(D) to check
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統計： A(33), B(0), C(2), D(3), E(0) #3792846
統計： A(33), B(0), C(2), D(3), E(0) #3792846
