13、----What′s the matter? You look unhappy these days．

----     

A．I′m sorry to hear that．    B．It′s none of your business．

C．Really ? What is it?         D．I failed an important test．

13、D

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----What′s the matter? You look unhappy these days．

----     

A．I′m sorry to hear that．    B．It′s none of your business．

C．Really ? What is it?         D．I failed an important test．

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