13. Today, air pollution causes several serious problems worldwide, one of ______ is acid rain.(A) t

問題詳情

13. Today, air pollution causes several serious problems worldwide, one of ______ is acid rain.
(A) those
(B) that
(C) them
(D) which

參考答案

答案：D
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上一篇 : 12. What do you think about the theory ______ the universe came from a big bang?(A) how (B) that (C)
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