问题
选择题
All passengers ___ to show their tickets next time.
A．require
B．will require
C．are required
D．are to require
答案
答案：C
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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All passengers ___ to show their tickets next time.
A．require
B．will require
C．are required
D．are to require
答案：C
are required to do(被要求)是被动语态,主动语态是require sb. to do.