到底是31th March,还是31st March?

到底是31th March,还是31st March? 英语几月31号到底是31st还是31th? 5月21日用英文怎么写?是May 1st还是May 1th?好像1日和31日末尾就是st，21日就是th，到底是怎样 31号的英文应该是31st还是31th? 5月31日用英文表达,是May 31st,还是May 31th? 11日英文简写后面到底是st还是th帮个忙●﹏● 求助,在英文序数词31后面是加st吗?还是加th? 英语日期11号也要st吗是st还是th? 是On the afternoon of March the 14th还是I n the afternoon of March the 14th? It was _yestersayA 21th March ; FridayB Friday ; March 21th C March 21th ; Friday D Friday ; march 21st 21的序数词缩写是21th还是21st 21的缩写是21st还是21th? 25th 26th 28th 30th 31st英文咋写? on the morning of March 31st与in the morning of March 31st都正确吗?这两个答案都正确吗?一套题的答案用的是ON,而英语辅导报上的答案是IN,哪个正确还是都正确? 12月31日用英文怎么表述?31th Dec.还是 31st Dec? 英语中31号应该写为31th,31st,还是两个都可以 英译汉 USA on the 31st of March and arriving in Wuhan,China on the 2nd of April.I will be leaving the Atlanta Georgia,USA on the 31st of March and arriving in Wuhan,China on the 2nd of April.究竟是3月31日到达武汉，还是4月2日到达武 写出序数词 22nd 31st 43rd 55th 101st 80th