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
They are not aware of the reasons ______ people are unwilling to discuss insurance.
A．when
B．where
C．why
D．how
单项选择题
It was difficult for him to buy good shoes because he had such a big ______ of feet.
A．pair
B．size
C．couple
D．number
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