问题
选择题
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
答案
答案：C
根据句子意思，本题要使用被动语态，所以只能在CD中选择，又因为it 为单数，所以要选择C
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