问题
I tried ________ it out in this way, but I failed (失败)．—Why not ______ it in some other ways
A:to work; try doing
B:to work; try to do
C:working; to try to do
D:to working; to try doing;
B:to work; try to do
C:working; to try to do
D:to working; to try doing;
正确答案是：
