—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：考查时态和语态。根据语境判断，此处表示“新机器正在被检测”，因此此处用现在进行时的被动语态。