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
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Language is a city, to the building of ______ every human being has brought a stone.
A. which
B. that
C. it
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______, we decided to go swimming in the se
a.A. It being a fine dayB. The day was fineC. It was a fine dayD. Being a fine day
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