Rain is very popular South Korean solo singer.He started to sing ______ April 2001A.atB.inC.onD.by选哪个?为什么?

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Rain is very popular South Korean solo singer.He started to sing ______ April 2001A.atB.inC.onD.by选哪个?为什么?

Rain is very popular South Korean solo singer.He started to sing ______ April 2001A.atB.inC.onD.by选哪个?为什么?
Rain is very popular South Korean solo singer.He started to sing ______ April 2001
A.at
B.in
C.on
D.by
选哪个?为什么?

Rain is very popular South Korean solo singer.He started to sing ______ April 2001A.atB.inC.onD.by选哪个?为什么?
B
at+地点
in+模糊的时间
on+精确的时间
by不加时间

B
当时间精确到某一天~~~不管加月份年份的~~~都要on
但精确到月份~~~~就in了~~~年也是in

B
不是具体一天。。