单项选择题

A．a variety of
B．various
C．varied
D．varying
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单项选择题
A．Playing the piano.B．Typing.C．Making a photocopy.D．Taking a picture.
A．Playing the piano.
B．Typing.
C．Making a photocopy.
D．Taking a picture.
单项选择题
A．would changeB．changeC．are changedD．have changed
A．would change
B．change
C．are changed
D．have changed
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