问题补充：
The 30th London Olympic Games on July 27th, .
A. will be held
B. is held
C. was held
D. has been held
答案：
A. will be held
B. is held
(答案→)C. was held
D. has been held
解析：句意：第30届伦敦奥运会在7月27日举行了。通过时间状语可知，此动作发生在过去，奥运会应该是被举行，故选C.
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