問題詳情

15. The problem with unconventional currency is all the trust ________ to make it work, said the economist.
(A) require
(B) to require
(C) that is required
(D) which requires it

參考答案

答案：C
難度：簡單0.75
統計：A(0),B(2),C(6),D(0),E(0)