积时式采样器{}有时会开不动塞不严，造成该通未通该堵未堵。
A、顶塞开关A
暂无解析
Newdriversarefarmore________tohaveaccidentsthanexperienceddrivers.
Mrs.Smithlockedboththefrontandthebackdoorsbeforeshewenttobed______thatsomeonemightstealintothehouseatnight.
正常足月新生儿开始喂母乳的时间是（）
Suchperson_______youdescribeisrarenowadays.
He‘sworkinghard_____.
