1．(2012·唐山质检)—What's that terrible noise，David?
—Oh，I forgot to tell you.The new machines in the nearby plant________ .
A．were tested B．will be tested
C．are being tested D．have been tested
解析：考查动词的时态。根据问句中的What's that terrible noise 可知，这里应该用进行时态，噪音是机器正在被检测时发出的，所以用现在进行时的被动语态。
答案：C
