单项选择题

______ he daydreamed, Peter saw figures in the sky.

A．Until
B．Since
C．While
D．During
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单项选择题
Clothing made of plastic fibres has certain advantages over ______ made of natural fibres like cotton, wool, or silk.
A．one
B．the one
C．that
D．what
单项选择题
Once our chickens started laying eggs, we had such a __ of eggs that we were giving many away to our neighbors.
A．output
B．surplus
C．production
D．plenty
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