All passengers to show their tickets next time.A. requireB. will requireC. are requiredD.

发布时间：2020-08-15 01:21:20

All passengers      to show their tickets next time.
A. require
B. will require
C. are required
D. are to require

网友回答

A. require
B. will require
(答案→)C. are required
D. are to require
解析：are required to do(被要求)是被动语态,主动语态是require sb. to do.
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