after an hour ,an hour later用法有何区别呢例:Our maths teacher came to school at 8 and lef___________.A.in an hour B.afer an hour C.an hour later D.before an hour

after an hour ,an hour later用法有何区别呢例:Our maths teacher came to school at 8 and lef___________.A.in an hour B.afer an hour C.an hour later D.before an hour
after an hour ,an hour later用法有何区别呢
例:Our maths teacher came to school at 8 and lef___________.
A.in an hour B.afer an hour C.an hour later D.before an hour

after an hour ,an hour later用法有何区别呢例:Our maths teacher came to school at 8 and lef___________.A.in an hour B.afer an hour C.an hour later D.before an hour
after an hour并无特指的时间点,而an hour later特指从现在起往后

前一个可表示任意时间点后五分钟 后一个是从现在其五分钟