单项选择题

The author of the report is well （） with the problems in the hospital because he has been working there for many years.

A. informed
B. enlightened
C. acquainted
D. acknowledged

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单项选择题
21（）

A.imagination
B.creativity
C.necessity
D.illusion
单项选择题
In Africa, educational costs are very low for those who are （）enough to get into universities.

A. ambitious
B. fortunate
C. aggressive
D. substantial
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