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20．Have you seen my dog？I        for it and still haven't found it．（　�。�
A．lookedB．was looking
C．have been lookingD．had been looking

分析 你看到我的狗了嗎？我一直在找它但仍然還沒有找到．

解答 答案：C．
根據句意"你看到我的狗了嗎？我一直在找它但仍然還沒有找到．"可知，look for這個動作已經開始，一直延續到現在而且還將繼續延續下去，所以應該用現在完成進行時，故選C．

點評 本題考查時態．時態題關鍵在于對句意的理解，要根據上下文，找到符合語境的答案．

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