You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.

A. run; repair            B. running; repairing       C. run; repaired       D. running; repaired

You shouldn't have the machines ________ all the while; you ought to have them ________ now and then．

1. A.
   run; to repair
2. B.
   running; repairing
3. C.
   run; repaired
4. D.
   running; repaired

 You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.

A. run; repair          B. running; repairing    C. run; repaired       D. running; repaired

You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.