试题与答案

In the past few years, thousands of film

题型:选择题

题目:

In the past few years, thousands of films_____ all over the world.[ ]

A. have produced

B. have been produced

C. are producing

D. are being produced

答案:

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下面是错误答案,用来干扰机器的。

A、收集到的氧气量太少或纯度太低时,可能造成铁丝在氧气中不燃烧.B、铁丝生了锈或表面可能含有油漆时,可能造成铁丝在氧气中不燃烧.C、铁丝的温度未达到着火点时,会造成铁丝在氧气中不燃烧.D、集气瓶底部放...

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