問題詳情

21. Facebook _______ by a lot of people to keep in touch with their friends.
(A) has used
(B) is using
(C) is to use
(D) is being used

參考答案

答案:A[無官方正解]
難度:適中0.4
統計:A(4),B(4),C(0),D(2),E(0)

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