单项选择题

In the geography lesson, the teacher told the children that the earth ______ round like a ball.

A．was
B．is
C．were
D．had been
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单项选择题
______ Liu Xiang failed to compete in the 2008 Beijing Olympic Games, he is still a hero in the eyes of our Chinese people.
A．Although
B．Since
C．So
D．Because
单项选择题
We never dared to ask him a question ______
A．did we
B．didn't we
C．dared we
D．daredn't we
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