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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