__ in the stratosphere is depleted is not completely understood.
(A) How ozone (B) While ozone
(C) Ozone (D) Ozone that
答案是(A)
是因為可以還原成兩個句子
How is ozone in the stratosphere depleted?
That is not completely understood.
請問大家，我這樣理解正確嗎?
謝謝!
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※ 編輯: innevertears 來自: 140.113.224.240 (03/11 15:32)