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I wonder ____ we can solve this hard problem.

A. what else   B. how else  C. that    D. as if

I wonder ____ we can solve this hard problem.

A. what else   B. how else  C. that    D. as if

I wonder ____ we can solve this hard problem.

A. what else   B. how else  C. that    D. as if

I wonder ____ we can solve this hard problem.

A. what else   B. how else  C. that    D. as if