使用钻床钻孔时，工件是否需要牢固可靠地装夹()
A、不需要B
暂无解析
重写句子：Ihavecheckedmydocumentsseveraltimes.Istillcan’findttheproblem.(compoundsentence)
Theypreferto_______therestofthemorningwalkinginthegarden.
Itisdifficultto________theimplicationbetweenthelines.
ThethemeofThanksgivinghasalwaysbeen________.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
