Question

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

Answer 1

B

考察賓語從句。賓語從句的考察點：1.連接詞；2.語序；3.時態。先從賓語從句的語序入手，應選擇陳述句語序，排除A,C，再根據時態，應選擇過去時態。故選擇B。其中what做主語。