问题补充:
23.— 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
答案:
A. were tested
B. will be tested
(答案→)C. are being tested
D. have been tested
解析:可联系答.案.网客服索取。