問題詳情

18. The satellite’s purpose is to find sources of air pollutants,including exhaust gas, carbon dioxide and carbon monoxide_____ from factories.
(A) emit
(B) emits
(C) emitted
(D) emitting

參考答案

答案:C
難度:適中0.601852
統計:A(14),B(21),C(130),D(40),E(0)

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