三大从句专项复习高考热点和易错点总结归纳1 .2 .2. Scientists have advanced many theories about why human beings cry tears, none of _ has been proved.A. whom B.which C.what D.that3 .3.(2017 南京、淮安三模）Keeping a regular sleep schedule is important for setting a babys body clock, _ researchers note should be in place by about 4 months of age.A.whose B.which C.when D.where4 .5 .6 .4.2017 连云港、宿迁、徐州三模）We sell a lot of products offshore and the opportunity to open up markets in regions _ we dont currently sell a lot to is a g
