4.

答案：登入後查看
統計： A(46), B(0), C(2), D(0), E(0) #3823224

詳解 (共 1 筆)

#7310781
A. machinery is operating on an assembly line. 
B. Workers are packing boxes by hand. 
C. The factory floor is being swept.
D. Safety goggles are hanging on the wall.
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