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Difficult in practice, this new technique hasn’t been applied. A.operated B. to

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Difficult in practice, this new technique hasn’t been applied. A.operated B. to

Difficult _____ in practice, this new technique hasn’tbeen applied.

A.operated          B. to be operated       C.operating        D. to operate

 

试题答案

【答案】

D

【解析】

试题

标签：newtechniquehasnthisdifficult

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