单项选择题

All the references she has obtained for her doctoral dissertation ______ about twenty items.

A．make up for
B．add up to
C．come up with
D．put up with
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单项选择题
With prices ______ so much, it is impossible for the company manager to stick to the original budget.
A．waving
B．swinging
C．fluctuating
D．vibrating
单项选择题
Professor Jeffrey's lecture on the recycling of waste paper and other garbage will show can still be improved.
A．that the municipal authorities have done
B．how those the municipal authorities have done
C．how what the municipal authorities have done
D．that how the municipal authorities have done
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