. He was told that it would be at least three more months he could recover and return to

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A. when
(答案→)B. before
C. since
D. that
解析：it was some time before…是一个很有用的句型，其字面意思是“在……之前过了一段时间”，通常可转译为“要过一段时间才会……”，如：It will be five years before we meet again. 五年以后再见。It may be a matter of months before it’s ready. 要准备好可能得数月时间。