单项选择题

This terrible accident happened（）the cold evening of June 6, 1987.

A．in
B．to
C．at
D．on

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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

All passengers are（）to show their tickets.

A．ordered
B．required
C．wanted
D．forced

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