可以的，请看2021高考英语新全国卷2语法填空中的一个句子：

I’ve always loved the ocean. In the seventh grade, I started volunteering at the Monterey Bay Aquarium in California. I was upset to learn that many sea animals eat plastic garbage,thinking it is food.

I decided to do something to educate people about this problem. I held presentations at schools to teach kids about plastic waste. I wanted to reach businesses too. I decided that if I learned of a company which / that used a lot of plastic, I’d send it an email urging it to cut back.

One day, I saw a commercial for a health-care company. People in the ad were using plastic straws (吸管). I found the contact information of the company and emailed its president. I told him how harmful plastic could be to the environment and asked him to consider using more eco-friendly options. I was so excited when he wrote back to me. He said he would make sure that the company cut its use of plastic straws in half.

I kept going. Whenever I heard of businesses using plastic, I’d send an email. One of the biggest companies I wrote to was Alaska Airlines. A company representative wrote back and told me the airline was switching over from plastic to paper cups on all of its 1,200 daily flights.

文中蓝色部分的 I was upset to learn that many sea animals eat plastic garbage, thinking it is food.

现在分词短语的逻辑主语就是与从句的主语保持一致。句意为：当我得知许多海洋动物将塑料垃圾认为是食物而误吃时，我感很难过。