题目内容
(改错,每个句子只有一处错误,请指出并改正)(How often)(A) did you (exercise)(B)? For about (an hour)(C). ______.
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题目内容
(改错,每个句子只有一处错误,请指出并改正)(How often)(A) did you (exercise)(B)? For about (an hour)(C). ______.