We used to ________, because that was when we could spend some time together．A.look forward to my parents ing backB.look forward my parents to e backC.looking forward to my parents ing backD.looking forward my parents to e back
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A解析sed to do sth是一个固定句型，意思是“过去常常做某事”。比较：be used to doing sth习惯做某事look forward to doing sth期待做某事