He tried his best to solve the problem,______ difficult it w
He tried his best to solve the problem,______ difficult it w
He tried his best to solve the problem,however difficult it
He tried his best to solve the problem,_______difficult it w
He tried his best to solve the problem __difficult it was 为什
___difficult the problem was,he tried his best to solve it.
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He tried his best to slove the problem,_A___difficult it was
The determined boy tried his best to solve the problem,_____
but he found the problem difficult to solve
-------he managed to solve the problem A.was it how that B.w
we had to___ to solve the maths problem A .tried our best B.
we had to___ to solve the maths problem A.tried our best B.t