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题库 / Prep2008E1-SC-200
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.
tend not to bother to recover a perishable treat if
they tend not to bother recovering a perishable treat
tending not to bother to recover a perishable treat it
tends not to bother recovering a perishable treat
tends not bothering to recover a perishable treat it
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提问：
1、and并列的是can和tends？
2、所以【researchers have discovered】充当的是什么呢？
1.对，
2.可以看成插入语
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