阿摩線上測驗
108. The technician has worked at the manufacturing plant ______ it opened in 2010.
(A) when
(B) while
(C) that
(D) since
答案：登入後查看
統計： A(6), B(2), C(1), D(61), E(0) #3823128
統計： A(6), B(2), C(1), D(61), E(0) #3823128
