单项选择题

All passengers are ______ to show their tickets.

A．ordered
B．required
C．wanted
D．forced
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单项选择题
I'm still unable to make myself ______ in the discussion, which worries me a lot.
A．to be understood
B．understanding
C．understood
D．understand
单项选择题
Dick has never been on time, ______
A．has Dick
B．hasn't Dick
C．has he
D．hasn't he
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