Difficult _____ in practice, this new technique hasn’t been applied.A．operatedB．_刷题宝

题干

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

A．operated

B．to be operated

C．operating

D．to operate

上一题下一题 0.64难度单项选择更新时间:2013-08-29 09:51:45

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