两道英语单项选择1、— Have they found out the _____ of the fire?— Yes.

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两道英语单项选择
1、— Have they found out the _____ of the fire?
— Yes.It was a cigarette end that _____ the fire.
A.cause; started B.reason; caused
C.causing; caused D.reason; cause
2、She won’t come over for a visit unless________.
A.being invited B.invited C.inviting D.was invited
答案是AB,绝对没错,

1.
“他们找到火灾原因了吗?”“嗯,是一支烟引起的火灾.”
cause意为导致……的因素/原因,如本句“导致火灾的原因”；而reason仅有原因的意思,如“我喜欢这件衣服的原因”,这是没有任何因素导致的,很单纯的原因的意思.
Start本意“开始”或“使……开始”,引申义“启动”、“点火/生火”；cause作为动词意为“导致”,如“带来麻烦cause sb some trouble”,“导致头痛cause headache”,“导致失败cause his failure”等,所以显然最佳选Start fire
2.
完整的说“unless invited-除非她被邀请了”应为unless she is inveted,因后边的she和主句主语she同指一人,所以she is省略,这样的用法经常见到

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