半封闭活塞机:where did they( )the hole?

来源：百度文库 编辑：高考问答 时间：2024/07/08 07:53:26
a,dig
b,digging
c,dug
d,have dug

A.dig
用原型，因为有了助动词did

dig
用原形
这是一个考过去动词的一般疑问句

where did they( )the hole? Where are they going tomorrow？ Did they go by bus是什么意思? what did they do over the weekend ? They did not pay any attention. 英文歌曲 where did you sleep last night Where Did You Sleep Last Night 吉他谱 Where and when did break dance begin? Where did you go on vacafion? where are they going ______ field trip