正确答案: B

managed

题目：40_______

解析：B

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举一反三的答案和解析：

[单选题]So far nobody has claimed the money in the library.

discovered

[单选题]Alexander tried to get his work in the medical circles.

recognized

[单选题]Which of the following is true?

The underground water in Saudi Arabia might run out in 50 years.

[单选题]下列各句中，加点的成语使用不恰当的一项是

这是一位已故著名作家的作品，由于各种原因一直没有发表，这次出版对编辑来说也有点敝帚自珍的意味。

[单选题]大豆原产我国，是重要的油料作物和食用植物蛋白来源。( )

正确

[单选题]In our class, when the bell rang and the teacher closed his book, it was a___________ for everyone to stand up.

signal

[单选题]最古老的裸子植物尚未具备裸子植物全部的基本特征。( )

正确