The equipment _____ out of order, the experiment has to be put off.【单选题】

时间：2021-06-29 03:40:25 解答: 87 次

The equipment _____ out of order, the experiment has to be put off.

A. has been

B. being

C. is

D. be

正确答案：

参考解析：

暂无解析

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