三道高中英语单选.1、People around the world_________Christmas Tree ev

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三道高中英语单选.
1、People around the world_________Christmas Tree ever since 1510.
A、decorated
B、have decorated
C、have been decorated
D、have been decorating
2、The small country_______since the 1880s.
A、has come into existence
B、has been in existence
C、has been existed
D、has begun to exist
3、_____ at the back of the room was a shy girl with two big eyes.
A、Sit
B、Sat
C、Seated
D、Seating
C和D怎么选?
第三题的B为什么不选？

1.D
主动语态.
从过去到现在一直在做某事,现在还在做,就要用现在完成进行时.
2.B
since the 1880s是一段时间,不能用短暂性动词.排除A、D.
exist是不及物动词,没有被动语态.排除C.
3.C
seat用于动词时是这样用：sb be seated.
再问：第三题：girl 和 seat是主谓关系还是动宾关系？谢谢
再答：从语法上看，girl 和 seat只能用动宾关系。但是我们不必钻这种牛角尖，只记住人做主语时如果用sit，就要用主动语态，如果用seat就要用被动语态。这样就可以了。
再问：那第三题能不能选B啊，谢谢。
再答：不能选B。这一题其实是一个倒装句： A shy girl with two big eyes was seated at the back of the room. 其主语是A shy girl with two big eyes. 如果选B，就变成这样一个句子了： A shy girl with two big eyes was sat at the back of the room. 这样a girl与sit就是动宾关系了。这是不对的。

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