问题
选择题
He asked his father why he was not able to hatch chickens ______hens could.
A．however
B．while
C．as
D．although
答案
答案：B
题目分析:句意：他问他父亲他为什么不能孵小鸡而母鸡却能。A然而，不管，不论；B然而；C由于，当……时；D尽管。根据句意可知前后句内容是转折关系，故选B。
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