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200. (T-3-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. A. tend not to bother to recover a perishable treat if B. they tend not to bother recovering a perishable treat C. tending not to bother to recover a perishable treat it D. tends not to bother recovering a perishable treat E. tends not bothering to recover a perishable treat it
想请教一下大家,这里的“researchers have discovered,” 是作什么成分?这道题的句子结构没看明白
PS:答案为D |
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