问题
选择题
The textbook is filled with cases about ________ our life has developed thanks to new inventions.[ ]
A．what
B．where
C．why
D．how
答案
答案：D
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The textbook is filled with cases about ________ our life has developed thanks to new inventions.[ ]
A．what
B．where
C．why
D．how
答案：D