单项选择题

I'd like to take advantage of this opportunity to express my sincere ______ for your help.

A．appreciation
B．guarantee
C．regulation
D．recreation
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单项选择题
Which of the following best summaries Marlow' s ideas
A．People's needs cover a wide range.
B．People's needs vary among individuals.
C．People have more lower-order needs than their higher-order ones.
D．People's abstract desires are more important than the basic ones.
单项选择题
I will never forget the ten years ______ we both spent in the little village in the southwest mountains range.
A．when
B．in which
C．which
D．of which
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