The world has a big headache and it ----- by money .It began

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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
主要想问什么时候表被动但实义动词前不加be.
或许我说得不是很准确，抱歉
特此补充
请主要回答：
什么情况之下，动词的主动形式可以表示被动，以及靠什么决定使用“be+动词过去分词形式”。

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：C
译：这世界出了个很令人头痛的事.这都是钱惹的祸.是去年从美国开始的.
析：从这个by知道,为被动语态,主语为it,排除ABD
主要想问什么时候表被动但实义动词前不加be.
答:被动语态由助动词be(的某种时态形式）+及物动词的过去分词构成.
有时可不用助动词be而用get,同样能表示被动.

The world has a big headache and it ----- by money .It began he took out a map of the world and began to draw lines on it It's in Reptile World.It has a big,long mouth.It's( ) 英语翻译(1)it' svery big.it has a long nose and big ears (2)it's the ship hit a rock and it began to s---- The world has changed,and we must change with it it's very big .it has a long bnose and big ears.是什么意识猜谜：It is big.It has two big ears and a long nose. it's an elephant.it's so big .it has a long ( )and a ( )mout the sea is a new world to us and it is a big place.we know t it'small.it usually has two big eyes and a beautiful tail.it It has two short legs and a big mouth.It is yellow.It can sw