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
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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 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 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
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 30minutes．（三十分钟后）会议三十分钟后结束.
can you finish it within 30minutes?（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.
选D
有具体时间，April 4th，4月4日，用on
无具体时间，June，6月，用in
你好！
选D。
具体的日子，要用介词on，故on April 4th。在几月，用介词in，因为一个月有好多天，没有具体的日子。
另：星期前也用on，因为确切的那天。如 on Sunday。
D on in
具体到某一天前用ON，在某年/月/季度等用in
加油！不明白再问！如果帮到你，请采纳，谢谢！
选D
第一个空后是具体的日期，具体到某一天用on
后一空是月份，用in
他将在四月四号动身去北京，然后六月回来