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[讨论]grammar
1.The universe is estimated----- between 10 million and 20 billion years old.
A being B to be C which is D is I choose c, but the correct answer is b, i don't know why?
2. The land O of 1982 divided the western lands belonging to the US into territories , each to be govern temporarily by its settlers.
why choose this, and plz tell me how to correct?
Can u tell me how to use primary, is this always be a adj.??
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