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 t-初中英语-n多题

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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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