29. After Carl pointed out the problem, he went on _______ some ways to solve it.
(A) to suggest
(B) suggesting
(C) suggested
(D) being suggested
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統計: A(35), B(39), C(12), D(1), E(0) #3069695
統計: A(35), B(39), C(12), D(1), E(0) #3069695