US and allied officials have said they have seen no credible evidence of civilian casualties(伤亡)from the air campaign,and they say that precision weapons are used in the strikes in an effort to （）being hurt.

A．prevent civilians on

B．prevent civilians from

C．Prevent civilians to

D．Prevent civilians in

–How did it ____that you missed the bus ?

- I’m sorry I got up late.

A．come up

B．come about

C．come out

D．come on