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  3. How many times have the doctors tested the children for five years? Doctors found that the lungs of the children whose mothers

How many times have the doctors tested the children for five years? Doctors found that the lungs of the children whose mothers

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问题 How many times have the doctors tested the children for five years?
  Doctors found that the lungs of the children whose mothers smoked______.
选项 A、had developed as fast as they should
B、had not developed as fast as they should
C、had not developed at all
D、had developed faster than they should
答案B
解析 答案就是文中这句话：But the doctors found that the lungs of the children whose mothers smoked had not developed as fast as they should。
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