问题
选择题
Could you tell me ?
A．who you are waiting for
B．who were you waiting for
C．what was happened
D．how to do
答案
A
本题所选答案是作tell的宾语。宾语从句应用陈述句语序，故排除B；C答案中happen是不及物动词，不能用于被动语态；D答案中do是及物动词应带宾语，而how是副词，不能作宾语。故正确答案为A。