单选题：The packing and sorting is being done by________.

题目分类：英语
题目类型：单选题
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题目内容：

The packing and sorting is being done by________. A．a business sponsor
B．other students in college
C．the College of Marin teachers
D．Musoke's college classmates

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________ many times, but he still couldn't understand it.

________ many times, but he still couldn't understand it.A．Having been told B．H

分类：英语题型：单选题

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You know that's right, ________ ?

You know that's right, ________ ?A．is it B．isn't it C．do you D．don't you

分类：英语题型：单选题

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More students than one ________ there.

More students than one ________ there.A．has been B．have been C．had been D．would

分类：英语题型：单选题

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光传送网（OTN）特点不包括（　　）。

光传送网（OTN）特点不包括（　　）。A．支持多种业务 B．满足用户对带宽持续增长 C．与现有SDH网络兼容性 D．不能管理多根光纤中的所有波长

分类：英语题型：单选题

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若向量a=(1，2)，b=(-3，4)，则(a•b)(a+b)等于( )

若向量a=(1，2)，b=(-3，4)，则(a•b)(a+b)等于( )A．20 B．(-10，30) C．54 D．(-8，24)

分类：英语题型：单选题

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