问题补充:
I didn’t see Laura at the party last night. Do you know ?
A. why didn’t she come
B. what happened
C. when would she arrive
D. where she has been
答案:
A. why didn’t she come
(答案→)B. what happened
C. when would she arrive
D. where she has been
解析:考察宾语从句。宾语从句的考察点:1.连接词;2.语序;3.时态。先从宾语从句的语序入手,应选择陈述句语序,排除A,C,再根据时态,应选择过去时态。故选择B。其中what做主语。