问题
Therearetwothousandstudentsinourschool,______aregirls.[ ]
A: two-thirdsinwhich
B: two-thirdsinthem
C: two-thirdsofthem
D: ofwhomtwothirds
B: two-thirdsinthem
C: two-thirdsofthem
D: ofwhomtwothirds
正确答案是: