--- What on earth are the police busy with?

--- They have been investigating how the train crash __________.

A．came out

B．came across

C．came about

D．came up

用人单位应当按规定及时申报应当缴纳的社会保险费，对未按规定申报的，社会保险经办机构可（）

A.暂可暂按该单位上月缴费额的110%确定应缴数额

B.暂按该单位上月缴费数额的1倍以上3倍以下确定应缴数额

C.暂按该单位上月缴费数额的120%确定应缴数额

D.暂按该单位上月缴费数额的90%确定应缴数额