三大从句复习.ppt

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2. Scientists have advanced many theories about why human beings cry tears, none of _____ has been proved.
A. whom
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3.(2017 南京、淮安三模）Keeping a regular sleep schedule is important for setting a baby's body clock, ______ researchers note should be in place by about 4 months of age.

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、宿迁、徐州三模）We sell a lot of products offshore and the opportunity to open up markets in regions _______ we don't currently sell a lot to is a great one.
A. where
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3.(2017连云港、宿迁、徐州三模）It is estimated that China has over 770 million 4G users, which doubles ______ it was in 2015.
A. that
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3.---What do you think makes the TV show letters Alive a big hit?
---_____ the kind of humanity behind every letter touches the heartstrings of the audience.
A. That

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