27. According to the article, what is NOT a feature of the course?
(A) Learning materials to help with learning
(B) Instructions from an experienced professional
(C) Flexible learning without time limits
(D) Access to live online group discussion forums
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統計: A(0), B(1), C(2), D(3), E(0) #3557109
統計: A(0), B(1), C(2), D(3), E(0) #3557109