问题描述：
His spoken English ___ in the past few years.
A was improved B has improved C has been improved D improved 选什么,为什么?improve什么情况下用被动,什么情况主动表被动?谢
A was improved B has improved C has been improved D improved 选什么,为什么?improve什么情况下用被动,什么情况主动表被动?谢
问题解答：
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