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9.He will leave for Beijing __________April 4th and come bac

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9.He will leave for Beijing __________April 4th and come back __________ June.
9.He will leave for Beijing __________April 4th and come back __________ June.A.in; on B.on; on C.in; in D.on; in
9.He will leave for Beijing __________April 4th and come bac
选D,on  
1)表示具体日期.  
they arrived in shanghai on may  
25.他们在五月二十五日到达上海.  
in  
1)表示"时段"、"时期",在多数情况下可以和dur- ing互换,前者强调对比,后者强调持续.in(during)1988(December,the 20th century)在一九八八年(十二月、二十世纪)  
i returned to Beijing in the middle of June.我是六月中回北京的.但如果表示"在某项活动的期间",则只能用during.  
during my military service(the trip)在我服役期间(在旅行期间)  
2)表示以说话时间为基点的"(若干时间)以后",常用作将来时态谓语的时间状语.如这时要表示"(若干时间)内",常用within.比较:  
the meeting will end in 30minutes.(三十分钟后)会议三十分钟后结束.  
can you finish it within 30minutes?(三十分钟内)你能在三十分钟之内完成这件事吗?  
 但在过去时态中,in可用于表"在若干时间以内",这时不要误用during.the job was done during a week.(wrong)  
the job was done in a week.(right)这工作在一星期内就完成了.