問題詳情
39. To protect our intellectual property, all visitors __________ to present their identification with aphoto.
(A)ask
(B)asking
(C)to ask
(D)are asked
參考答案
答案：D
難度：簡單0.757143
統計：A(21),B(11),C(2),D(106),E(0)
用户評論
【Mi de Chen】評論
intellectual property-智慧財產權identification-身分證明all visitors ___被要求_______ to present --動詞為被動式be+pp. 故選D