单项选择题

It happened to be very cold（）the morning of our sports meet.

A.at
B.of
C.on

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单项选择题

A.a packet of prawn
B.two packets of prawn
C.a packet of prawns

单项选择题

A.some；a
B.an；some
C.some；some

单项选择题

A.The express train is expensive.
B.OK. I‘ll five you a hand.
C.Sorry, the express bus has gone.
D.On your right. It‘ll leave in 5 minutes.