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【单选题】
对于工程项目管理而言，风险是指可能出现的影响项目目标实现的（ ）。A.
不确定因素
B.
确定因素
C.
不可能因素
D.
可能因素
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举一反三
【单选题】She knows a lot about China as she has been to China ________.
A.
for the forth time
B.
four times
C.
a fourth time
D.
for four times
【单选题】What is known about Prof. Grant?
A.
She has been to Mexico.
B.
She assigns long research papers.
C.
She teaches cultural anthropology.
D.
She collects ancient relies.
【单选题】听力原文：Susan is fluent in Spanish now that she has been to Mexico. What do we know about Susan?
A.
She learned Spanish in America.
B.
She doesn't know Spanish.
C.
She improved her Spanish in Mexico.
D.
She knew Spanish before going to Mexico.
【简答题】某地为推广先进企业的生产经营管理经验，对效益最好的几个企业进行调查，这种调查是属于（ ）。
【单选题】What is known about Prof. Grant?
A.
She has been to Mexico.
B.
She assigns long research papers.
C.
She teaches cultural anthropology.
D.
She collects ancient relies.
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