All passengers ___ to show their tickets next time.
A．requireB．will requireC．a(chǎn)re requiredD．a(chǎn)re to require
C
are required to do(被要求)是被動(dòng)語(yǔ)態(tài),主動(dòng)語(yǔ)態(tài)是require sb. to do.
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