单项选择题

（）is known to all, China is a developing country.

A. Which
B. What
C. As
D. That

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If the building project（）by the end of this month is delayed, the construction company will be fined.

A. being completed
B. is completed
C. to be completed
D. completed
单项选择题
He was swimming in the river（）it began to rain.

A. when
B. since
C. after
D. until
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