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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单项选择题
On the hill are maple trees ______ leaves have turned red.
A．who
B．whom
C．whose
D．which
单项选择题
Kenny was finishing his assignments when his father ______ home from work.
A．comes
B．came
C．has come home
D．is coming home
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