39
(A) as
(B) where
(C) but
(D) which

答案：登入後查看
統計： A(21), B(15), C(176), D(57), E(0) #727552

詳解 (共 1 筆)

#2553661

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

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