15. The real challenge is how to balance complex variables like safety and convenience, all while _____ politicians that
they should invest in infrastructure.
(A) convince
(B) convinced
(C) convincing
(D) to convince
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統計: A(3), B(19), C(73), D(9), E(0) #1566099
統計: A(3), B(19), C(73), D(9), E(0) #1566099