-----What is the noise?-----Oh I forgot to tell you. The new machine .A. was testedB. wil

问题补充：

-----What is the noise?

-----Oh, I forgot to tell you. The new machine .

A. was tested

B. will be tested

C. is being tested

D. has been tested

答案：

A. was tested

B. will be tested

(答案→)C. is being tested

D. has been tested

解析： 根据-What is the noise，可知是现在正在进行的动作，所以新机器应是正在被测试。用现在进行时态的被动语态。