halfway through the experience ,there was a power failure and teacher told us to stop A when we were only B being only C when only D having been

halfway through the experience ,there was a power failure and teacher told us to stop A when we were only B being only C when only D having been
halfway through the experience ,there was a power failure and teacher told us to stop
A when we were only B being only C when only D having been

halfway through the experience ,there was a power failure and teacher told us to stop A when we were only B being only C when only D having been
A,因为后面的逻辑主语不能作为前面的主语,必须另加主语

D