—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A. did… take                                      B. does… take                                  C. did…cost
A
考查時態(tài)和詞義辨析!敖獬鲞@道難題花費了你多長時間?”“差不多30分鐘!眛ake后加時間;cost后加錢。根據(jù)句意可知,應(yīng)該用過去時。故選A。
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