单项选择题

I purposely ______ from extending these observations to any length.

A．abstain
B．sustain
C．retain
D．detain
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单项选择题
A．takesB．spendsC．demandsD．asks
A．takes
B．spends
C．demands
D．asks
单项选择题
The ability to store knowledge makes computers different from every other machine______ invented.
A．ever
B．thus
C．yet
D．as
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