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
When Bob and his friends came, we（）our supper then.
A．had
B．were having
C．have
D．are having
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单项选择题
He_____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
A．should
B．must
C．wouldn’t
D．can’t
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