問題詳情

【題組】39
(A) as
(B) where
(C) but
(D) which

參考答案

答案：C
難度：適中0.549451
統計：A(11),B(5),C(50),D(19),E(0)

用户評論

【不要讚.會被販售】評論

 When it is dark, plants 40 a lot of oxygen, and so there is new oxygen in the air for us to breathe.