The world has a big headache and it ____
问题:
The world has a big headache and it _____ by money. It began in America last year. [ ]
A. cause
B. causes
C. is caused
D. are caused
The world has a big headache and it _____ by money. It began in America last year. [ ]
A. cause
B. causes
C. is caused
D. are caused