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Nimbostratus clouds are thick, dark grey clouds __________ forebode rain.

A. what

B. which

C. what they

D. which they

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A. are talking

B. talk

C. talks

D. talked

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A. faster

B. fastest

C. fast

3-D printing ____ complex tools and components.

A. is used for produce    

B. is used to produce    

C. uses for producing

D. uses to produce