一Why did Miss Wang look so worried when we saw her?
—Because she wondered________.
A.where did the other students go
B.when would the policeman come
C.what her students have done during the trip
D.if her students had survived the earthquake
D 宾语从句要用陈述句形式,如果主句是一般过去时,从句用相应的过去时。选D。