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Whether dying patients      be helped to end their lives is a tough moral question.
A.must B.shouldC.mightD.would
B

试题分析:考查情态动词。濒死的病人是否应该被安乐死,这是一个很棘手的道德问题。A必须;B应该;C可能;D愿意。根据句意可知,这里表示的意思是“是否应该接受安乐死”,故选B。
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