—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(shí)態(tài)和詞義辨析!敖獬鲞@道難題花費(fèi)了你多長時(shí)間。俊薄安畈欢30分鐘!眛ake后加時(shí)間;cost后加錢。根據(jù)句意可知,應(yīng)該用過去時(shí)。故選A。
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