题目内容：

I don’t know where the key is,but I suppose I _______ it at home.
A should have left
B could have left
C must leave
A是错的……

优质解答

I don’t know where the key is,but I suppose I ____B___ it at home.
A should have left
B could have left
C must leave
我不知道钥匙在哪里,但是我猜想我可能放在家了
希望能够帮到楼主