The nurse allowed the visitors to remain the visiting hours，though it was not permitted.A.

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A. within
B. at
(答案→)C. beyond
D. before
解析：句意：过了探视时间护士仍然允许探视者留在病房，尽管按规定这么做是不允许的。这里用beyond“超过，超出…的范围”，at“在…地方”，within“在…范围之内”，before“在…前面”，所以选C。