-What’s that noise?-- Oh I forgot to tell you. The new machine .A. was testedB. wi

问题补充：

---- What’s that 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：本题考查时态和语态。对方询问的是正在发出的噪音是什么缘故，所以回答的是目前正在发生的动作，，“机器正在被检测”， machine与test之间又是被动关系，因此用现在进行时的被动语态。答案为C。