在C++中，打开一个文件就是将这个文件与一个( )建立关联：关闭一个文件就取消这种关联。
A．类
B．流
C．对象
D．结构
参考答案：B
At that moment, I was just standing by the window in my room, I could see what was occurring on the street.
A．from which
B．from whose
C．from that
D．from where
「もう一度」的意思是「再来一遍」。
