问题补充：
---Do you know ?
---At the end of July.
A. how soon is your sister coming back home
B. how often Nancy hears from her pen friend[
C. when the London Olympic Games were held
D. when will the new computer game come out
答案：
A. how soon is your sister coming back home
B. how often Nancy hears from her pen friend[
(答案→)C. when the London Olympic Games were held
D. when will the new computer game come out
解析：句意：你知道伦敦奥运会何时举行吗？在七月末。宾语从句用陈述句的语序，故选C
