单项选择题

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

A．reviews
B．reference
C．reaction
D．recommendation

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单项选择题

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

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

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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