—Have you ever visited the Water Cube? —Yes. When I served as a volunteer in Bei
题型:不详难度:来源:
—Have you ever visited the Water Cube? —Yes. When I served as a volunteer in Beijing, I it twice.A.have visited | B.visited | C.had visited | D.had been visiting |
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答案
B |
解析
考察时态。根据when I served as a volunteer,可知,该句主句用过去时, 句意为,---你去过水立方吗?--是的,当我作志愿者的时候,我去过两次。 |
举一反三
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