单项选择题

We were all overjoyed at the news ______ the experiment turned out a success．

A．which
B．that
C．when
D．what
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单项选择题
I'm not the one who pushed you，______
A．am I
B．was I
C．did I
D．do I
单项选择题
_______，this or that
A．Which is better
B．What is better
C．What is the best
D．Which is the best
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