选择题：My parents and I couldn’t get into the house last night because __________ of

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题目类型：选择题
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My parents and I couldn’t get into the house last night because __________ of US had the key．

A.all

B.either

C.neither

D.none

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The reason __________ the president kept silent is still unknown．

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使胰蛋白酶原活化的物质是（　　）

使胰蛋白酶原活化的物质是（　　） A．糜蛋白酶原B．肠激酶C．胰蛋白酶D．糜蛋白酶E．碱

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请选出划线部分读音不同的选项（）。

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In nearly every town or city center in the UK, on most days of the week you can

In nearly every town or city center in the UK, on most days of the week you can find one or more peo

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根据下列短文，回答{TSE}题。　　There are various in which individual economic units

根据下列短文，回答{TSE}题。　　There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional

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