单项选择题

Language is a city, to the building of () every human being has brought a stone.

A. which
B. that
C. it
D. what

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单项选择题
Businessmen make most of their income from profit () by producing and selling products.

A. earning
B. is earned
C. earn
D. earned
单项选择题
(), we decided to go swimming in the sea.

A. It being a fine day
B. The day was fine
C. It was a fine day
D. Being a fine day
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