阿摩線上測驗
18. Ensuring food safety is one of those federal government ________ we only notice when it fails.
(A)functional
(B)function
(C) functioned
(D)functions
答案：登入後查看
統計： A(23), B(36), C(10), D(81), E(0) #1889769
統計： A(23), B(36), C(10), D(81), E(0) #1889769
