I____(turn) around but I couldn't see anything.

问题描述:

I____(turn) around but I couldn't see anything.

turn around 使)调转方向;(使)转向。
在此处应该用一般过去时态,因为有couldn't,过去时态

I turned (turn) around but I couldn't see anything.

填 过去式 turned ,和后面的 couldn't 对应.