20. Researchers are increasingly turning their attention to _____ exacerbate existing health conditions and lead to hearing loss in vulnerable
populations.
(A) noise pollution can
(B) that noise pollution
(C) how noise pollution
(D) how noise pollution can
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統計: A(0), B(5), C(23), D(90), E(0) #3246655
統計: A(0), B(5), C(23), D(90), E(0) #3246655