Sheamodelbeforesheasuperstar.A-优题课

题文

She ________ a model before she _______ a superstar.

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

科目英语题型单选题难度较难

知识点：主语+系动词+表语时态辨析

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