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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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