30. No sooner had the panel begun the Q&A _____ the projector shut down and the screen went black.
(A) when
(B) than
(C) that
(D) because
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統計: A(7), B(10), C(3), D(3), E(0) #3895753
統計: A(7), B(10), C(3), D(3), E(0) #3895753