你知道“开幕式kāi mù shì”是什么吗？
A. Open the door
B. Driving test
C. Opening ceremony
开 is an easy hint, usually means to open. Where as 幕 refers to curtain or screen. One of the meanings of 式 is event or ceremony.
北京冬奥会今天（4日）晚8点在中国国家体育场鸟巢(niǎo cháo - Bird's Nest)举行开幕式。
开幕式以及闭幕式(bì mù shì - closing ceremony)的总导演(dǎo yǎn - n. director)为中国知名导演张艺谋。
答案：C