27. The word "maintain" in line 20 is closest in meaning to
(A) improve
(B) monitor
(C) preserve
(D) restore
答案:登入後查看
統計: A(0), B(1), C(4), D(0), E(0) #802715
統計: A(0), B(1), C(4), D(0), E(0) #802715