Often when he______have been doing something that was given him he wasted his time drawin

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Often when he______have been doing something that was given him, he wasted his time drawing little pictures.

A.must

B.need

C.should

D.would

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。