He was_____weak_____ he couldn’t stand up.

A．such, that

B．so, that

C．very, that

D．so, as to

设有以下语句，则z的二进制值是
char x=3，y=6，z；
z=x^y＜＜2：

A．00010100

B．00011011

C．00011100

D．00011000