Lily is look __her book横线上该填什么?Lily is looking __her book

Lily is look __her book横线上该填什么?Lily is looking __her book
Lily is look __her book
横线上该填什么?
Lily is looking __her book

Lily is look __her book横线上该填什么?Lily is looking __her book
Lily is looking for__her book寻找

ing.

对，原因就在那个with那里，因为用with，动作前面加的be就应该用is而不是are，语法上就是这样子，这些事要记住的，加油噢

填for
look for sth.意思是寻找。
希望能帮到你~

for
貌似look后面应加ing

你这问题本身就有问题，is 后面的 look 怎么可能是原型？ 如果你想问 look 和 her book 之间要填什么介词的话我可以告诉你是 at

for
from
through
-ing at
into

可以填for，意思是：丽丽正在寻找她的书 be looking for sth 寻找某物
可以填at， 意思是：丽丽下在看她的书 be looking at sht 看某物