请教高人指点，实在看不明白

nikema

Q14:

A scrub jay can remember when it cached a particular piece of food in a particular place, researchers have discovered, and tend not to bother to recover a perishable treat if stored long enough to have rotted.

1. tend not to bother to recover a perishable treat if
2. they tend not to bother recovering a perishable treat
3. tending not to bother to recover a perishable treat it
4. tends not to bother recovering a perishable treat
5. tends not bothering to recover a perishable treat it

nikema

答案是d，可是这个tends和谁平行呢？谁是他的主语？如果是jay的话那么为什么不是a cerub jay can remember and tend 呢？多谢!

XIAOXIANGXI

researcher 是插入语,用杨鹏的话就是 这句属于废话，直接删掉.