2. 外语
  3. (By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expedi

(By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expedi

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问题 (By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expeditions.
选项 A、By the time
B、in July 1969
C、will have
D、space
答案C
解析 by the time表示“到……时候”。由于从句中用了过去时态，所以主句表示过去的过去应用过去完成时。改“will have”为“had”。
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