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
______ you agree or disagree with them, you must follow their instructions.
A．Whether
B．No matter
C．Whenever
D．Whatever
单项选择题
All passengers are ______ to show their tickets.
A．ordered
B．required
C．wanted
D．forced
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