I didn’t see Laura at the party last night. Do you know ?A. why didn’t she comeB. what hap

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。