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
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統計： A(3), B(2), C(1), D(46), E(0) #3823128
統計： A(3), B(2), C(1), D(46), E(0) #3823128
