This machine is very easy______. Anybody can learn to use it in a few minutes.
A．operating B．to be operating C．operated D．to operate
D

試題分析：考查非謂語動(dòng)詞。句意：這臺(tái)機(jī)器很容易操作。任何一個(gè)人都可以在幾分鐘內(nèi)學(xué)會(huì)使用它。operate與的邏輯主語是人，是主動(dòng)關(guān)系，排除B、C；sth is easy to do...做某事很容易，故選D。
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