问题
选择题
The diamond mine _______ accidentally by a little boy when he was playing hide-and-seek. [ ]
A. discovered
B. was discovered
C. has been discovered
D. would discover
答案
答案：B
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The diamond mine _______ accidentally by a little boy when he was playing hide-and-seek. [ ]
A. discovered
B. was discovered
C. has been discovered
D. would discover
答案：B