单项选择题


A．help
B．contributor
C．aid
D．element
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单项选择题
Which commercial usage of the Internet does the author NOT refer to
A．Buying airline tickets.
B．Trading stocks.
C．Applying for a credit card.
D．Opening a bank account.
单项选择题
A．arrivedB．reachedC．remainedD．concluded
A．arrived
B．reached
C．remained
D．concluded
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