选择C
should have done:应该做而没做 be engaged in doing something :忙于做某事
句子的意思是说他本应该工作,但是他却忙于做其它事情
otherwise：否则；
therefore /thus：因此；
though：虽然,尽管
nevertheless ：然而; 尽管如此; 不过; 仍然; 有转折意味,更符合语境
关于连词he should have been working ,but he was _______ engaged
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