Whilehewasinvestigatingwaystoi

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While he was investigating ways to improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.

A．a ,/

B．a ,the

C．/, the

D．the ,a

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Little ________ about her own safety，though she was in great danger herself.

A．did Rose care	B．Rose did care
C．Rose does care	D．does Rose care

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Not until he left his home ________ to know how important the family was for him.

A．did he begin	B．had he begun
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—I'm glad you like it.

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For a moment nothing happened.Then ________ all shouting together.

A．voices had come	B．came voices
C．voices would come	D．did voices come

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Only after Mary read her composition the second time ________ the spelling mistake.(2012·天津)

A．did she notice	B．she noticed
C．does she notice	D．she has noticed

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