US President Barack Obama said on Thursday that ______ Afghanistan election appeared to have been ______ success.

A．/ ;a

B．the ;a

C．the;the

D．/ ;the

由于发包人或者监理工程师的指令增加工程量和附加工程，造成工期延长和费用增加时，承包人提出索赔属于（）。

A.默示索赔

B.反索赔

C.综合索赔

D.工程变更索赔