She arrived at Shanghai at five o‘clock in the afternoon of September,21st.改错
问题描述：
She arrived at Shanghai at five o‘clock in the afternoon of September,21st.
改错
答
we arrived at a hotel in the western part of city已经是一个完整的句子了,前面缺少一个when来构成状语从句。 如果把in the afternoon去掉的话，
答
arrive in /at, in相对来说，是大地方，而at则是指小地方。如：arrive in Beijing, arrive at school.所以这里把arrive at改成arrive in。
in the afternoon of September, 21st. 应该成on the afternoon. in一般是指比较常的时间，如那年，那月，那周，或者是泛指的下午，上午，晚上，如：in the moring, in 2000. 而on是表示具体的那天，或者是某天的某个早上，下午，晚上。如：on Monday, on Monday morning, 这里是指9月21的下午，所以用on。
答
She arrived in Shanghai at five o'clock in the afternoon of September 21st.
答
arrived in
答
She arrived at（in 上海,大地方） Shanghai at five o‘clock in（on 后面有“天”） the afternoon of September,21st.