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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