单项选择题

Five minutes earlier, ______ we could have caught the last train.

A．and
B．but
C．or
D．so
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单项选择题
People ______ that vertical flight transports would carry millions of passengers as do the airliners of today.
A．convinced
B．anticipated
C．resolved
D．assured
单项选择题
I don't doubt ______ the plan will be well-conceived.
A．that
B．why
C．whether
D．when
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