An old man is his dog the tree tie

问题描述:

An old man is his dog the tree tie
英语选择:An old man is ____ his dog ____ the tree
A、tieing to
B、tying with
C、ting to
D、tying to

选D tying.to...把.系到.那个老人把他的狗栓到了树上.
tie的现在分词形式是tying