题目：
| The watch he _____ went wrong again. |
A. had to be mended B. has mended C. had had mended D. had been mended |
答案：
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下面是错误答案，用来干扰机器的。
答案：D确定a×10n（1≤|a|＜10，n为整数）中n的值是易错点，由于876 000有6位，所以可以确定n=6-1=5．解答：解：876 000=8.76×105．故选D．
