单选题：John often attends public lectures at the University of Oxfo

题目分类：公共英语四级
题目类型：单选题
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题目内容：

John often attends public lectures at the University of Oxford, chiefly （　　）his English. A．to improve
B．improving
C．to have improved
D．improved

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答案解析：

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He wore dark glasses to avoid （　　）.A．having been recognized B．to be recognized C

分类：公共英语四级题型：单选题

Once environmental damage（　　）, it takes many years for the s

Once environmental damage（　　）, it takes many years for the system to recover.A．h

分类：公共英语四级题型：单选题

11)

11) A．if B．when C．what D．that

分类：公共英语四级题型：单选题

4)

4) A．chance B．risk C．opportunity D．danger

分类：公共英语四级题型：单选题

初守睢阳时，士卒仅万人

初守睢阳时，士卒仅万人

分类：公共英语四级题型：单选题