阿摩線上測驗
21. The rescue mission was on the point of taking off when the weather condition made _____ necessary to call it off.
(A) it is
(B) it was
(C) that
(D) it
答案：登入後查看
統計： A(22), B(38), C(32), D(152), E(0) #2062323
統計： A(22), B(38), C(32), D(152), E(0) #2062323
