单项选择题

Classroom testing, if well done, most certainly ______ a stimulus to study and real learning.

A．acts for
B．acts on
C．acts as
D．acts to
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单项选择题
A poor man has to ______ many things which a rich man regards as almost necessaries in life.
A．go through
B．go without
C．go over
D．go about
单项选择题
I feel quite confident in ______ Mr. Jackson to you for the vacant post of research assistant.
A．submitting
B．proclaiming
C．recalling
D．recommending
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