21. Even if he thinks there are some major flaws in the plan, the intern dare not ______ what the manager says.
(A) question
(B) questions
(C) questioned
(D) questioning
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統計: A(107), B(29), C(22), D(61), E(0) #2062544
統計: A(107), B(29), C(22), D(61), E(0) #2062544