Correct the errors in the following sentence.Looking down at the

Correct the errors in the following sentence.
Looking down at the grass , which had suddenly begun to seem very squashy. I realized I had hiked into a marsh of some kind.
【正确答案】：Looking down at the grass , which had suddenly begun to seem very squashy, I realized I had hiked into a marsh of some kind.
【题目解析】：p45