They have been training so hard that they're c_____ to win the race.

Where have they been? All flights ______ because of the storm,they decided to take the train.a.having cancelled b.were cancelled c.have been cancelled d.having been cancelled I have been there by train.I have ______get. They have a____ been there have they travelled on a train?作出否定回答 what have they been doing 是什么时态 What places have they been?怎么翻译? where have they been?是现在完成时吗? they have been in kate's for they have been the subject of debate they have been acting up more lately they have been there before.so have i they have been there before.(),() 改为同义句 They have been here once.把been换成came怎么样 they said they have been married for ten years They have never been opened.为什么不可以是They never have been opened. they have been here since 1988,对1988进行提问,（）（）have they been here? They have been friends for 6 years. 改为同义句 They have been friends _______ _______. They have been skating for five hours 同义句 They have been skating_______ _____ ________ ______