The machine requires , so the workers are required ready.
A. repair；to get
B. repairing；to get
C. repairing；getting
D. to be repaired；getting
网友回答
A. repair；to get
(答案→)B. repairing；to get
C. repairing；getting
D. to be repaired；getting
解析：require doing含有被动的意思，可以译作有被……的需要；而require sb. to do表示要求某人做某事。