—I tried ________ it out in this way, but I failed (失败)． —Why not ______ it in some other ways?

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1. —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

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