_______ many times, he finally understood it．A．TaughtB．TeachingC．Having taughtD．Having been taught-高

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• But one day I __________________ what I often tell him to do.A. was caught not doing B. was caught n
• ——Will you come to my office when youyour work? ——Sure. A．finishedB．are finishingC．have finishedD．wi
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• Class is beginning. Will you please get the blackboard .A．to cleanB．cleaningC．cleanedD．having clean
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