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    【题目】 CT is really useful invention, with which doctors can find out what's wrong with a patient more easily.

    A. A; a B. The; an C. The; a D.A ;the

    【答案】C

    【解析】句意：CT是一种有用的发明，医生可以依靠它很容易地找到病人哪里出毛病了。指科技发明一般用定冠词the；一种有用的发明，应用不定冠词，useful以辅音音素/j/开头，故用a。故选C。

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