答案是C.这是强调句结构.结构是：It was - - - - - that -- -- - - .它的原始句是：How did he manage to solve the problem?要成为强调句,先变成：it was how that he managed to solve the problem.再把how放在句首,成为：How was it that he managed to solve the problem?
-------he managed to solve the problem A.was it how that B.w
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