No one knows when and where________.
| A．was she born |
| B．did she come from |
| C．she work |
| D．she was born |
（届福建省泉州市高三质检英语试卷）
The company has recently taken on fifty new workers some of_______ have just graduated from university.
| A．which | B．them | C．those | D．whom |
（届江苏省淮州中学高三3月份模拟英语试卷）
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
| A．that | B．as | C．which | D．what |
（届重庆市南开中学高三二诊模拟英语试卷）
The director made two films last year，one of __________ was set in Chongqing．
| A．them | B．those | C．what | D．which |
（届安徽省马鞍山市高三第一次教学质量检测英语试卷）
I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
| A．which | B．it | C．what | D．where |
（届江西省师大附中鹰潭一中宜春中学等重点中学高三联考英语试卷）
Living in the mountain area has its problems , _____ obtaining water is a big problem.
| A．of which | B．for what | C．as | D．whose |