题干
— What;s the matter?
— I am having trouble ______ who has taken my book.
A：finding
B：looking for
C：finding out
D：looking up
答案(点此获取答案解析）
C
— What;s the matter?
— I am having trouble ______ who has taken my book.
A：finding
B：looking for
C：finding out
D：looking up
