The field research will take Joan and Paul about five months; it will be a long
time ____ we meet them again.
| A．after | B．before | C．since | D．when |
I lost a book, ______I can't remember now.
| A．whose title | B．its title | C．the title of it | D．the title of that |
You're the only person ______I've ever met ______could do it.
| A．who;/ | B．/; whom | C．whom;/ | D．/; who |
.In our factory there are 2,000 workers, two thirds of ____are women.
| A．them | B．which | C．whom | D．who |
The letter is from my sister, ______is working in Beijing.
| A．which | B．that | C．whom | D．who |
—I‘d like a pen which _________ well.
—Will this one _________?
| A．writes； do | B．writes； work |
| C．is written； do | D．is written；work |