Question

She ________ a model before she _______ a superstar.

A．have been, became	B．had been, become
C．had been became	D．has been, become

Answer 1

C

试题分析：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。