问题
选择题
________ you have seen both fighters，________ will win?
A．Since；do you think who
B．As；who you think
C．When；whoever
D．Since；who do you think
答案
答案：D
其中do you think是插入成分，其余部分是宾语从句，作think的宾语；由于引导词在从句中作主语，所以要用主格who(不用whom)。