摘要： The experiment on the moon in July, 1971 proved that Galileo’s theory of falling objects true. A. was done; is B. being done; was C. done; is D. having been done; was
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The experiment _______ on the moon in July, 1971 proved that Galileo's theory of falling objects _______ true.
- A.Was done; is
- B.being done; was
- C.done; is
- D.having been done; Was