问题补充：
—This physics problem is too difficult. Can you show me , George?
—Sure.
A. what to work out
B. to work it out
C. how to work it out
D. how to work out it
答案：
A. what to work out
B. to work it out
(答案→)C. how to work it out
D. how to work out it
解析：四个选项分别表示解决什么，解决它、怎样解决它和怎样解决它（不合语法），人称代词作动词短语的宾语时，一般要放在动词后面介词前面，所以选C。
