30.
(A) solve
(B) solves
(C) solving
(D) solved
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統計: A(20), B(22), C(177), D(42), E(0) #3637873
統計: A(20), B(22), C(177), D(42), E(0) #3637873
30.
(A) solve
(B) solves
(C) solving
(D) solved