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高中英语题with a computer____each classroom,the students can surf

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高中英语题
with a computer____each classroom,the students can surf the internet conveniently.
a .having installed
b.installed
c.equipped
d.equipping

when they first arrived in____a famous tourist city,it was only a small town.
a.what it is now
b. what is now
c.which now is
d.now is

答案分别为D B
为什么呢?其他选项为何不可呢?
第一题:equipping表示给教室配备电脑,如果用equipped 应为equipped with而且主语应该是computer
第二题:what引导的句子作介词in 的宾语,what在句子中做主语.which通常用于定语从句中做主语或宾语