---Be careful. You might fall into the river.
---Thank you. I I so close to it．
A. didn’t know; am standing
B. don’t know; am standing
C. didn’t know; was standing
D. didn’t know; would standing
网友回答
A. didn’t know; am standing
B. don’t know; am standing
(答案→)C. didn’t know; was standing
D. didn’t know; would standing
解析：此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。主句的谓语动词是过去式从句的谓语动词也要用相应的过去时态。若从句表达的是真理或客观事实，不管主句的谓语动词是何种时态从句都要用一般现在时。根据语境可知此句表示我刚才不知道自己站的那么靠近它，现在知道了，故用过去时，故选C。