选B.
一般,过去完成时是接在完成时的后面,如这里的had不能凭空出来,句子里必须有have引导的过去完成时,这个句子中没有,只是一般过去时,所以,这里用B的一般过去时.这是作题的一个小诀窍.
Three months _________we knew it
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