Grammar Test A Answer 18
Washoe, the signing chimp, was questioned about how the other chimps were getting stains on the La-Z-Boy in their enclosure.
The zookeepers questioned Washoe, the signing chimp, about how the other chimps were getting stains on the La-Z-Boy in their enclosure.
On this one you have to supply the agent (the thing that is acting) because it is hidden in the original.