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    Difficult _____ in practice, this new technique hasn’t been applied.

    A．operatedB．to be operatedC．operatingD．to operate

    D

    解析试题分析：此处相当于because it is difficult to operate in practice，省略because it is之后就变成了 difficult to operate in practice. 句意：因为这种新技术很难在实践中操作，所以它没有被应用。
    考点：考查非谓语动词的用法。

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