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一道英语题,求解析.A 14-year-old boy from the USA was described as a

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一道英语题,求解析.
A 14-year-old boy from the USA was described as a hero yesterday after he saved the life of a woman in another country.
Dean Bluey from Dallas,Texas,was a school boy who has much 31 in computer.One day,he 32 an email to a friend on the Internet.Suddenly he received a message saying “Help! Pain! Help!”."The message was from Finland, 33 kilometers away from America.
“I didn't know 34 I should do,”Dean said to a reporter afterwards.“It was really difficult to tell if the message was real.”So Dean did nothing at first. 35 the message kept coming.
31.A.interest B.interested C.interesting D.interests
32.A.sent B.sends C.was sending D.is sending
劳烦大家帮我解析下这两个选项,为什么31选A,32选C?
小弟感激不尽!
31题应该要填名词,interest有可数和不可数两种形式,可数表示的是“利益”,不可数表示的是“兴趣”,这里按意义和much这个量词来判断,都应该填不可数名词.
32题之所以选过去进行时,是因为句意强调的是当他在上网的时候,收到了一条信息,而不是发完邮件触发的事件.