The old couple are living ,for their only son works abroad after graduation.
A. on their own
B. of their own
C. separately
D. particularly
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(答案→)A. on their own
B. of their own
C. separately
D. particularly
解析：“惟一的儿子在国外工作，因此这对老年夫妇独自生活。”on ones own“独自地”;of one’s own“某人自己的”，C、D两项与句意不符。