问题
This software______ protect computers from being attacked by viruses and it took my brother a long time to ______ how to start it.
A:is intended for; come out
B:intends to ; turn out
C:is mean to; figure out
D:is meant for; work out;
B:intends to ; turn out
C:is mean to; figure out
D:is meant for; work out;
正确答案是：
