这是个复合句,可以拆分成三个句子：1 did you know ；2 it's been found in laboratory testing ；3 some types of oil are really bad foir us
第一个that是是宾语从句的引导词,第二个是复合从句引导词
did you know that it's been found in laboratory testing that some types of oil are really
did you know that it's been found in laboratory testing that some types of oil are really
bad foir us?
我想问,第一个that启什么作用,第二个that又是什么意思,什么作用
bad foir us?
我想问,第一个that启什么作用,第二个that又是什么意思,什么作用
英语人气：796 ℃时间：2020-05-26 01:21:39
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