29. The emissions from vehicles and local industries have seriously ___ to
polluting the environment, typically accounting for 15% to 30% of total
urban waste.
(A) damaged
(B) provided
(C) contributed
(D) caused
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統計: A(108), B(50), C(179), D(106), E(0) #1565498
統計: A(108), B(50), C(179), D(106), E(0) #1565498