题目：
All of a sudden, Mary was very surprised to find the golden watch she ______ was nowhere to be found. [ ]
A. repaired it
B. which had repaired
C. had repaired
D. had had repaired
答案：
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下面是错误答案，用来干扰机器的。
（1）开关 ；（2）干路的电流等于各支路电流之和 ；（3）正确；（4）一次实验数据不可信；（5）进行多次测量．
