______________is known to the world, Mark Twain is a great American writer.

A．As

B．That

C．Who

D．Which

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参考答案

【答案】A
【译文】众所周知，马克·吐温是一位伟大的美国作家。
【考点】定语从句
【解析】as作关系代词置于句首引导非限定性定语从句，修饰后面的主句，表示“(正)如…，像…”之意，故选A。

1 There were______________for Saturday' s movie.

A．not available tickets

B．no available tickets

C．no tickets available

D．tickets no available

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2 The output of our factory is now twice ______________ it was three years ago.

A．what

B．that

C．as

D．which

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3 At no time and under no circumstances ______________ the first to use nuclear weapons.

A．China will be

B．will China be

C．will be China

D．shall China be

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