问题
选择题
She ________ a model before she _______ a superstar.
A．have been, became
B．had been, become
C．had been became
D．has been, become
答案
答案：C
题目分析：句意：她在成为一个超级巨星前是一个模特儿。根据句意从句用一般过去时态，主句用过去完成时。所以选C。
考点:考查动词时态。
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