某木材堆场发生火灾，燃烧面积约3000m2，其设计消防用水量为45L/s，若灭火用水供给强度为0.2L/s.m2，每辆消防车的供水量为30L/s，则火场需要()供水消防车。

A.20辆

B.19辆

C.18辆

D.16辆

---Could you tell me ________?       

---Yes. They ________ to the museum.

A．where the girls are; have gone

B．where were the girls; have been

C．where are the girls; have gone

D．where the girls were; have been