Her cousin ______ swim when he _____ six years old.[ ]A. can, is B. could, were C. could, was D. can
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题目简介
Her cousin ______ swim when he _____ six years old.[ ]A. can, is B. could, were C. could, was D. can
题目详情
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B. could, were
C. could, was
D. can, was
答案