問題詳情
【題組】15.It is difficult to trace the history of certain ancient beads because they
(A)are small in size
(B)have been buried underground
(C)have been moved from their original locations
(D)are frequently lost
參考答案
答案：C
難度：適中0.5
統計：A(0),B(4),C(5),D(0),E(0)