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_____ this instrument should have put its work permit number on the box.
A.Who checkedB.Whoever inspected
C.No matter who examinedD.Those who estimates
B
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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