20. Only after the meeting _____ how serious the situation was.
(A) they realized
(B) had they realize
(C) they did realize
(D) did they realize
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統計: A(47), B(57), C(26), D(116), E(0) #3426229
統計: A(47), B(57), C(26), D(116), E(0) #3426229