—Don’t you know your computer has been inflected with viruses?
— Really？No wonder it hasn’t_______ as properly as before.
A．managedB．controlledC．operatedD．appeared
C
operate用作不及物動詞, 意思為 “操作,運轉”，句意：難怪計算機不如以前運轉地正常了。其他選項均與句意不符：manage管理；經營生意；處理事務；control控制；支配；管理；appear出現(xiàn)；顯露；好像。
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