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