[单选题]The teacher came into the room, with his hands _______behind his back.

正确答案 ：C

crossed

解析：

参考译文：老师走进教室，手在背后交叉着。非谓语动词，若为被动，用with ste.-ed，若为主动，用with sth.-ing。

[单选题]下列不属于肾门的结构是 （ ）

正确答案 ：A

输尿管

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