问题描述:
The teacher stayed up late at night.__ the material for the lesson next week.
A.who prepares B.preparing C.prepared D.was preparing
请高手给个确切的答案,再讲下其中的语法知识.
A.who prepares B.preparing C.prepared D.was preparing
请高手给个确切的答案,再讲下其中的语法知识.
问题解答:
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