_____ 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引導(dǎo)主語(yǔ)從句，失去疑問(wèn)含義，表示強(qiáng)調(diào)"無(wú)論誰(shuí)；誰(shuí)……誰(shuí)就……"等于 anyone who；而who引導(dǎo)名詞性從句時(shí)， who保留疑問(wèn)含義"誰(shuí)"。
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