题目内容
3．---Be careful not to fall into the river．---Thank you，we didn't know wewere standing（stand） so close to it．
分析 ---小心不要掉到河里．
---谢谢，我们不知道我们站的如此的近．
解答 答案：were standing．know后是省略了that的宾语从句，主句是一般过去时，从句也用过去时，结合上下文可知动作正在发生，故用过去进行时was/were+doing，主语we，故were，故答案是were standing．
点评 本题旨在考查宾语从句这一语法，做这类题时，要从三方面考虑：一、选准连接词 二、连接词后紧跟从句的主语 三、若主句是过去时，从句要改为相对应的过去时．
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