49.To protect our intellectual property, all visitors __________ to present their identification with a photo.
(A)ask
(B)asking
(C)to ask
(D)are asked

答案：登入後查看
統計： A(21), B(16), C(13), D(194), E(0) #2081038

詳解 (共 1 筆)

#6189765
 intellectual property 智慧財產權
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