50. Mr. Lee used to be a teacher, but now he is an engineer by __________.
(A) cell
(B) resource
(C) profession
(D) occasion
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統計: A(75), B(64), C(1094), D(292), E(0) #1328723
統計: A(75), B(64), C(1094), D(292), E(0) #1328723