题目内容
( ) 17. Have some medicine and you'll be all right supper time.
A. for B. by C. at D. since
17. B by指时间时,表示"到某个时候为止,不超过某个时候"。
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题目内容
( ) 17. Have some medicine and you'll be all right supper time.
A. for B. by C. at D. since
17. B by指时间时,表示"到某个时候为止,不超过某个时候"。