— I tried       it out in this way, but I failed.
— Why not       it in some other ways?
A．to work; try doingB．to work; try to do
C．working; try to doD．to work; to try doing
A
try to do sth，表示努力做某事，而try doing sth，表示試著做某事，同時why not do sth，表示為什么不做某事，根據(jù)本題的用意，可知答案為A。
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