Question

The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.

1. A.
   had been repairing
2. B.
   was repairing
3. C.
   has been repairing
4. D.
   would be repairing

Answer 1

A
考查时态。由题干可知救护车的到来用了过去时，这位工人修窗户是在救护车到来之前，那么应该使用过去完成时，为了强调动作一直在发生，所以又用了过去完成进行时。