6. The offices in the building are not heatd _____but are joinly warmed by a central heating system.
(A)independtly
(B)involuntarily
(C)indispensably
(D)indifferently
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統計: A(110), B(25), C(30), D(18), E(0) #1532113
統計: A(110), B(25), C(30), D(18), E(0) #1532113