問題詳情

19.One should read books on ecology ___ about the threats to his environment.___________
(A)to learn,
(B) for the sake of learning
(C) will learn
(D) so that he shall learn"

參考答案

答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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