また、トピ主です。
早速、ファミリー・カテゴリーでCICホームページで調べてみました。
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Relationships that are not eligible
You cannot be sponsored as a spouse, a common-law partner or a conjugal partner if:
・you are under 16 years of age
you (or your sponsor) were married to someone else at the time of your marriage
・・you have lived apart from your sponsor for at least one year and either you (or your sponsor) are the common-law or conjugal partner of another person
・your sponsor immigrated to Canada and, at the time they applied for permanent residence, you were a family member who should have been examined to see if you met immigration requirements, but you were not examined or
・your sponsor previously sponsored another spouse, common-law partner or conjugal partner, and three years have not passed since that person became a permanent resident.