She ________ a model before she _______ a superstar.
A．have been, becameB．had been, become
C．had been, becameD．has been, become
C

試題分析：句意：在他成為一個(gè)超級(jí)明星之前他是一個(gè)模特。因?yàn)樵诤衎efore的主從復(fù)合句中，一般在從句中使用一般過去時(shí)，主句中使用過去完成時(shí)有時(shí)，也可以在從句中用過去完成時(shí)，主句中用一般過去時(shí)，這樣就可使描述更為生動(dòng)。故選C.
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