摘要： -How long it you to work out such a difficult problem? -About thirty minutes. A. did- take B. does- take C. did-cost
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—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A. did… take B. does… take C. did…cost
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—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A. did… take B. does… take C. did…cost
—About thirty minutes.
A. did… take B. does… take C. did…cost
—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A．did… take B．does… take C．did…cost
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