31. The teacher asked the students to keep the classroom __________.
(A) dirty
(B) noisy
(C) clean
(D) full
答案:登入後查看
統計: A(1), B(1), C(55), D(0), E(0) #3474203
統計: A(1), B(1), C(55), D(0), E(0) #3474203