Question

—That actor often joins in dfferent activities in Beijing. Do you know        ?
—For 5 years

1. A.
   how soon he will come back
2. B.
   how long he has stayed there
3. C.
   how long has he stayed there
4. D.
   how often does he go there

Answer 1

B
考查宾语从句的用法。根据回答“For 5 years”，需要用how long“多长时间”来提问；宾语从句使用陈述语序，确定B正确。