单项选择题

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

A．essential
B．available
C．reliable
D．responsible

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

A．Although
B．Whether
C．Since
D．When
单项选择题
From the following four options in choosing the most appropriate option（）

A．attainments
B．feasibility
C．entertainments
D．evolution
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