题目内容：

i am sorry to tell you that i ____on the playground
A.forget your books
B.forgot your books behind
C.have left your books alone
D.left your books behind

我选择了C.答案是D 求解~~

优质解答

D.left your books behind 为正确选项.
leave sth behind,是落下了某物；leave sb alone 让某人独自一人.这两个短语,后面跟的宾语不一样,一个是物,一个是人.如：Don't leave me alone,I need you.