单项选择题

In vain ______ try to persuade her to change her plan.

A．we did
B．did we
C．we would
D．would we
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单项选择题
My parents have lived here ______.
A．since 1986
B．many years ago
C．for many years ago
D．since 1966 ago
单项选择题
Five minutes earlier, ______ we wouldn't have missed the last bus.
A．or
B．and
C．but
D．so
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