单项选择题

All passengers are ______ to present hand baggage for inspection prior to departure.

A. required
B. requiring
C. requirement
D. requires
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单项选择题
Participants ______ to bring any special equipment as everything will be provided.
A. mustn't
B. don't need
C. need
D. needn't
单项选择题
If we ______ more free time, we would take the river cruise.
A. has
B. have
C. having
D. had
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