【简答题】阅读理解 Customs are social habits. They have been handed down through generations among groups, social classes, etc. Customs can be described as ways of doing things. They are particularly strong in soc...
【多选题】623负载的功率因数低,会引起()的问题
【简答题】听短文,判断正误,正确的写T,错误的写F。 ( )1. David and Jack are neighbours. ( )2. They have been friends for a long time. ( )3. Jack is a primary school student. ( )4. David wants to be a popular playe...
【单选题】— Where are the twins? — I think they _____ Hangzhou. They _____ there twice before. [ ]
A.
have been to; has gone to
B.
have gone to; have been
C.
have been to; have been to
D.
have gone to; have gone
【单选题】They must have been here the day before yesterday,____?
【单选题】They have never been to Beijing, -?
【单选题】现在市场上很多新款的汽车有这样的智能功能:司机坐在驾驶室内说“启动引擎”,汽车 立即开始发动。这里用到了