13. The police put a __________ before the main entrance to keep the protesters out.(A) boundary (B)

問題詳情

13. The police put a __________ before the main entrance to keep the protesters out.
(A) boundary
(B) barrier
(C) block
(D) brake

答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)