单项选择题

Neither Mary nor I ______ to Shanghai before.

A．has gone
B．have gone
C．has been
D．have been
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单项选择题
I am going to have a short rest as I ______ a headache.
A．take
B．have
C．feel
D．suffer
单项选择题
I really don't know ______.
A．to skate
B．how to skate
C．to skate how
D．how skate
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