"#include<br>intmain(void){<br>inta;<br>printf(""input integer number: "");<br>scanf(""%d"",&a);<br>switch(a){<br>case1:printf(""Monday\n"");<br>case2:printf(""Tuesday\n"");<br>case3:printf(""Wednesday\n"");<br>case4:printf(""Thursday\n"");<br>case5:printf(""Friday\n"");<br>case6:printf(""Saturday\n"");<br>case7:printf(""Sunday\n"");<br>default:printf(""error\n"");<br>}<br>return0;<br>}"
1.概念:以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”。2.时间状语:before, by the end of last year(term, month…),etc.3.基本结构:had + done.4.否定形式:had + not + done.5.一般疑问句:had放于句首。6.例句:As soon as we got to the station, the train had left.By the end of last month. We had reviewed four books.现在完成进行时