Look at those flowers,They need 选哪个啊

问题描述:

Look at those flowers,They need 选哪个啊
to be watering
watered
waters
watering
选哪个啊 说下理由谢谢

Look at those flowers,They need (watering).
瞧这些花.它们需要被浇水了.
sth need doing,某物需要被……,这个词组含有被动的意思.