Question

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

Answer 1

A

考查时态和词义辨析。“解出这道难题花费了你多长时间啊？”“差不多30分钟。”take后加时间；cost后加钱。根据句意可知，应该用过去时。故选A。