11．When we speak English today，we sometimes feel puzzled about which words or phrases_________．（　　）
A．useB．usingC．to be usedD．to use

分析 當我們今天講英語時，我們有時會困惑用哪些詞或短語．

解答 答案是D．本題考查非謂語動詞；題干中考查的是"疑問詞+to do"充當介詞about的賓語，相當于賓語從句；故排除A和B；并且句中出現(xiàn)了不定式動作的執(zhí)行者，故需要用主動表被動，答案是D．

點評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關注常見非謂語動詞的搭配．

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