21、_________ we went to see him, he _________ his research work.
A．The last time; devoted to B．Whenever; was busy to do
C．For the first time; was lost in D．Each time; was deep in
科目：高中英语 来源： 题型：
_________ we went to see him, he _________ his research work.
A．The last time; devoted to B．Whenever; was busy to do
C．For the first time; was lost in D．Each time; was deep in
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