单项选择题

How long ______ since I bumped into you and your sister at McDonald

A．is it
B．was it
C．had it been
D．has it been
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单项选择题
Mark plays ______ violin, while his brother prefers to play______ baseball.
A．the, the
B．the, /
C．/, the
D．/, /
单项选择题
There are many ______ nowadays in the universities.
A．woman teachers
B．women teacher
C．woman's teachers
D．women teachers
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