(According to) our estimate, only one (out of) three company managers (have been) trained in the (field of) management.

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问题 (According to) our estimate, only one (out of) three company managers (have been) trained in the (field of) management.

选项 A、According to
B、out of
C、have been
D、field of

答案C

解析 应改为has been。本句的意思是三个公司经理中的一个,因此用第三人称单数形式。
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