Don’t turn off the puter before closing all programs, you could have problems.
A. or
B. and
C. but
D. so
网友回答
(答案→)A. or
B. and
C. but
D. so
解析:句意:所有的程序关闭之前不要关上电脑,否则,你可能有问题。or 或者,否则; and 而且; but 但是;so 所以。根据空格后you could have problems,可知如果不按照前面的去做,就会有问题。故选A。