_____ 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)主語從句，失去疑問含義，表示強調(diào)"無論誰；誰……誰就……"等于 anyone who；而who引導(dǎo)名詞性從句時， who保留疑問含義"誰"。
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