A-A+
(By the time) Neil Armstrong and Edwin Aldrin
问题详情
(By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expeditions.
A．By the time
B．in July 1969
C．will have
D．space请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：bythetime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“willhave”为“had”。
