They have made their fortunes by doing e-business.
A. 他们为电子商务大赚了一笔。
B. 他们靠电子商务创造了幸运。
C. 他们靠电子商务发了大财。
D. 他们为电子商务创造了幸运。
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The development of science and __________ (technique) has made learning knowledge very easy for people.
The factory tried to _________ (promotion) sales of its products by cutting down their prices.
Renewable energy resources can be helpful in ______ (conserve) fossil fuels and reducing carbon emissions.
The package of the new drink is ______ (environment).