单项选择题

______ happens in the world makes us happy and sad by turns.

A. That
B. What
C. Which
D. Whether
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单项选择题
He worked well and was praised ______ in public．
A．a second time
B．twice time
C．the second time
D．for a second time
单项选择题
______ enough time，but I couldn't do it better．
A．I was given
B．Given
C．To be given
D．Though I was given
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