用fopen函数打开文件，操作完毕后用（  ）函数关闭它。

A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">fopen&nbsp;&nbsp; </span>

B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">&nbsp;open</span>

C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px; TEXT-DECORATION: none">&nbsp;fclose</span>

D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">close</span>