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Shoo!All of you should the changes while doing your experiment. [ ] A.center in

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Shoo!All of you should the changes while doing your experiment. [ ] A.center in

Shoo!All of you should ________ the changes while doing your experiment.

[]

A.center in

B.concentrate your attention on

C.focus to

D.be concentrated upon

试题答案

答案:B