选择题：It’s reported that by the end of this month the output of cement in the factory

题目内容：

It’s reported that by the end of this month the output of cement in the factory _____ by about 10%.

A.will have risen

B.has risen

C.will be rising

D.has been rising

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答案解析：

In the past 50 years, there _____ a great increase in the amount of research ___

In the past 50 years, there _____ a great increase in the amount of research _____ on the human brai

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Typical of the grassland dwellers of the continent( )，or pronghorn.

Typical of the grassland dwellers of the continent( )，or pronghorn.

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The security of a country is( )related to the safety of the rest world.

The security of a country is( )related to the safety of the rest world.

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