問題詳情
22. Dr. Nien was famously reluctant to have his biography written. But _____ Nien since 1990, Mr. Feng, the author of a critical study of Dr. Nien’swork, received not only his friend’s permission but access to a large collection of his manuscripts.
(A)have known
(B)having known
(C)knew
(D)to know
參考答案
答案：B
難度：適中0.675439
統計：A(22),B(77),C(6),D(3),E(0)