单项选择题

The author is well ______ with the problems in the hospital because he has been working there for many years.

A．advised
B．enlightened
C．acquainted
D．informed
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Before you start to make the cake, gather up all the necessary ______ and put them on the table in the kitchen.
A．factors
B．cosmetics
C．varieties
D．ingredients
单项选择题
The president did not ______ a date for his visit to Peru.
A．specify
B．signify
C．identify
D．recognize
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