问题
Why did Miss Yang 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
B:when would the policeman come
C:what her students have done during the trip
D:if her students had survived the earthquake
正确答案是：
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