The doctors are ________ about the guidelines under which they can carry out euthanasia.
A.at a stretch
B.at a loss
C.at random
D.at length
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正确答案： B 答案分析： 本题考查的是短语区分。 A.不休息地，连续地; B.不知所措，茫然，不了解; C.任意的，随便的; D.最后，终于。句意：医生们不了解执行安乐死的准则。
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