l forget ____ the door . l thought it was open.
问题描述:
l forget ____ the door . l thought it was open.
A.locking
B.to lock
写出理由
答
B.
forget doing sth 是忘记做过某事. (已做)
forget to do 忘记要去做某事. (未做)
题目中明显提示们还开着,所以肯定是未做,于是用不定式to do形式.