She can't find her pen.She 's looking _____ it.
问题描述：
She can't find her pen.She 's looking _____ it.
答
填for
look for 寻找（强调找的动作）
而find强调结果
答
look for 寻找
答
She can't find her pen.She's looking for it.
答
for
look for......寻找.......