单项选择题

It was in 2005（）we began to introduce this new technique into our company.

A．which
B．then
C．when
D．that

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单项选择题
That big dictionary（）Tom two hundred dollars.

A．spent
B．paid
C．cost
D．took
单项选择题
When Bob and his friends came, we（）our supper then.

A．had
B．were having
C．have
D．are having
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