单项选择题

The clever method (was) (paid attention) by very few technicians (until) (the) early 1970s.

A．was
B．paid attention
C．until
D．the
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单项选择题
Twenty years in prison (are) a ridiculously harsh penalty for an action (that) was, (after all), agreed upon by both people (involved).
A．are
B．that
C．after all
D．involved
单项选择题
As I looked at the carpet, I wished that it (could) speak, (since) it (must witness) many interesting events (in) the past decade.
A．could
B．since
C．must witness
D．in
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