The new dictionaries are very useful. They well and already. A．sell; have been sold out B．sold; had sold out C．sell; sell out D．are sold; have been sold out 题目和参考答案——青夏教育精英家教网—

题目内容

The new dictionaries are very useful. They well and already.

A．sell; have been sold out B．sold; had sold out

C．sell; sell out D．are sold; have been sold out

【答案】

【解析】

试题分析：某些可和well，easily等副词连用的不及物动词，如read，write，wash，sell等，可以主动语态表示被动含义，第一空就是这种用法，意思是它们很畅销。由副词already（已经）可知第二空用完成时态，意思是它们已经被销售完。故选A。

考点：动词的时态和语态。

点评：动词的主、被动语态由主语与谓语动词的关系决定，主语是动作的发出者用主动语态，是动作的接受在用被动语态；动词的时态由时间状语决定。

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B．trade along the Silk Road began earlier than once thought

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D．new light can now be thrown on ancient trading practices

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A．originated in the 2nd century BC

B．extended human migration into eastern Asia

C．began a million years ago

D．primarily benefited the Egyptians

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A．be brought back knowledge of Rome to the emperor	B．be discovered the Silk Road
C．be helped establish East-West trade	D．be travelled as far as Afghanistan

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