21. The results of the experiment were __________ by several unexpected variables, making them difficult to interpret.
(A) influenced
(B) determined
(C) controlled
(D) achieved
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統計: A(18), B(2), C(2), D(0), E(0) #3895132
統計: A(18), B(2), C(2), D(0), E(0) #3895132