---- 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
网友回答
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。