have been doing,had been doing,will have been down是什么
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have been doing,had been doing,will have been down是什么
have been doing,had been doing,will have been down是什么
have been doing,had been doing,will have been down是什么
have been doing 现在一直在做,
had been doing,过去一直在做
will have been down将在某个时候下来
英语时态区分have done .have been doing.had done.had been doing.有什么区别.
have been doing,had been doing,will have been down是什么
had been doing是什么语法?举个例子~有have/has been doing的说法吗?
have been doing sth
had been doing 是什么时态?
had been doing是什么时态
had been doing是什么时态
had been doing 和had been done有什么差别
had been doing 和had been done有什么差别?
have been doing 神马意思?
what you have been doing
has been doing have been done区别
have been doing 和have done 还有had done三者的区别,用法举几个例子,
had been doing是什么是时态?
had been doing是主动还是被动
have been doing ,have done和have doing区别
----Has Tom finished his home work yet?----I have no idea;he[ ] it this morning.A.was doing B.had been doing C.had done D.did
I’ll go to the library as soon as I finish what IA.was doing B.am doing C.have done D.had been doing