单项选择题

— ______ are the Olympic Games held
— Every four years.

A．How often
B．How soon
C．How long
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单项选择题
—Why not come and join us to play football — ______, but I must finish my homework first.
A．I'd like to
B．No, I mustn't
C．Yes, thank you
单项选择题
— What about the food on the plate — It ______ delicious.
A．smelling
B．smells
C．is smelt
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