单项选择题

How many pieces of advice on buying good hardware does the writer give us

A．Three.
B．Two.
C．One.
D．Four.
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单项选择题
I
A．A] is [
B．B] does [
C．C] will [
D．D] has
单项选择题
A．At the same timeB．On the other handC．On the contraryD．As a matter of fact
A．At the same time
B．On the other hand
C．On the contrary
D．As a matter of fact
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