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(2012·遼寧高考)This machine is very easy ________. Anybody can learn to use it in a few minutes.
A．operatingB．to be operating
C．operatedD．to operate
D
選D　考查非謂語動詞。在句型“主語＋be＋adj.＋to do”中，常用不定式的主動形式表示被動含義，故選D。
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