They have   __  most carefully the time and money needed to complete the project. [      ]

A. picked out

B. left out    

C. figured out

D. taken

导致女方两次自然流产最可能的原因为

A．子宫发育异常

B．年龄大

C．孕激素水平不足

D．胚胎染色体异常

E．免疫因素