题目内容
11. Difficult in practice, this new technique hasn't been applied.
A. operated B. to be operated
C. operating D. to operate
11. D 考査非谓语动词。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。
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