The first thing she did after she got up every morning was——the tulip.划线部分根据选项填to water,还有watered,water,waters四个选项.请问为什么选to water?

问题描述:

The first thing she did after she got up every morning was——the tulip.
划线部分根据选项填to water,还有watered,water,waters四个选项.请问为什么选to water?