单项选择题

In my opinion, some important problems need_________.

A．discuss
B．being discussing
C．discussed
D．discussing
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单项选择题
—Sue likes playing the piano, but she can't play it well.—_________.
A．So does her sister
B．Nor does her sister
C．So is her sister
D．So it is with her sister
单项选择题
— Oh, you made friends.— No. We _________friends since we met in Beijing.
A．have made
B．have become
C．have been
D．have turned
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