题目

_____ this instrument should have put its work permit number on the box. A. Who checked   B. Whoever inspected C. No matter who examined   D. Those who estimates 答案：B 解析: whoever引导主语从句，失去疑问含义，表示强调"无论谁；谁……谁就……"等于 anyone who；而who引导名词性从句时， who保留疑问含义"谁"。

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