－What’s that terrible noise?－The neighbours the lawn.A. mowB. are mowingC. have mowedD. w

问题补充：

－What’s that terrible noise?

－The neighbours the lawn.

A. mow

B. are mowing

C. have mowed

D. will mow

答案：

A. mow

(答案→)B. are mowing

C. have mowed

D. will mow

解析：考察时态。根据上下文可知这里是指现在正在进行的事情。故使用现在进行时。句意：—那个可怕的噪音是什么？—是邻居正在割草。