They have _____ a number of tests, but are not yet sure what is wrong with it.
They have _____ a number of tests, but are not yet sure what is wrong with it.
A、given
B、stood
C、done
D、built
【正确答案】：C
【题目解析】：do test 做测试，由于此处为现在完成时，因此使用过去分词，done
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