题目内容
The school has developed an online system students can choose their own teachers.
| A．which | B．that | C．whom | D．where |
D
解析试题分析：考查定语从句：句意：学校已经开发了一个在线系统，里面学生可以选择自己的老师。这是定语从句，先行词是an online system，定语从句中缺少的是地点状语，选D。
考点：考查定语从句
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| A．why; that | B．that; why | C．because; why | D．of which; that |
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| A．whom | B．their | C．whose | D．them |
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| A．when | B．where | C．that | D．which |
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| A．where | B．which | C．while | D．why |
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| A．that | B．when | C．where | D．which |
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| A．what | B．which | C．when | D．where |
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| A．which | B．where | C．what | D．whose |
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| A．the windows of which opened | B．the windows of it opened |
| C．its windows opened | D．the windows of which opening |