单项选择题

-- My model plane has disappeared, mum. I Who ______ have taken it

A．should
B．must
C．could
D．might
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单项选择题
I think girls can be ______ they want to be, whether it is a pilot or a manager.
A．wherever
B．however
C．whoever
D．whatever
单项选择题
Do you still remember ______ to our president when you visited our school last term
A．to be introduced
B．being introduced
C．introduced
D．to have been introduced
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