问题补充：
All the people in this company have been instructed
答案：
选Cinstruct sb to do sth.
变成被动语态是 sb.be instrrcted to do sth.
再变成完成时是 sb.have been instructed to do sth.
======以下答案可供参考======
供参考答案1:
C.to return 这是一个结构have been instructed to do
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