(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
【正确答案】
C
【答案解析】
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时。改“will have”为“had”
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