19. People have to keep the environment as clean and healthful _______.
(A) as possible
(B) as they are possible
(C) as can possible
(D) as can

答案:登入後查看
統計: 尚無統計資料

詳解 (共 1 筆)

#6827871
題目解析 這道題目的主要目的是測試考生...
(共 926 字,隱藏中)
前往觀看
0
0