早期先兆流产最常见的症状是（）.

A.宫口开大

B.少量 * * 出血

C.阵发性下腹痛

D.尿妊娠试验阴性

E.宫口有组织物堵塞

—Why are they taking all the equipment away？

—With the job         , they are leaving.

A．having done

B．being done

C．was done

D．done