单项选择题

A．Because it comes by mail.
B．Because it arrives a few days earlier.
C．Because it is much cheaper.
D．Because it is inconvenient to buy one from the bookstore.
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单项选择题
A．Write a report.B．Join his friends.C．Go to the laboratory.D．Go to the party.
A．Write a report.
B．Join his friends.
C．Go to the laboratory.
D．Go to the party.
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