单项选择题

From the following four options in choosing the most appropriate option（）

A．Although
B．Whether
C．Since
D．When

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单项选择题
From the following four options in choosing the most appropriate option（）

A．attainments
B．feasibility
C．entertainments
D．evolution
单项选择题
From the following four options in choosing the most appropriate option（）

A．organizations
B．organisms
C．humans
D．children
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