Difficult _____ in practice, this new technique hasn’t been applied.
A．operatedB．to be operatedC．operatingD．to operate
D

試題分析：此處相當(dāng)于because it is difficult to operate in practice，省略because it is之后就變成了 difficult to operate in practice. 句意：因?yàn)檫@種新技術(shù)很難在實(shí)踐中操作，所以它沒有被應(yīng)用。
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