I worked on the problem ____ a long time and I worked it out ____ myself ____ last.

A. for; by; at
B. in; with; on
C. on; by; in
D. for; for; at the
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科目：初中英語 來源：專項題 題型：單選題

I worked on the problem ____ a long time and I worked it out ____ myself ____ last.
[     ]
A. for; by; at
B. in; with; on
C. on; by; in
D. for; for; at the

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