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While the book on the top shelf, you need to be very careful. [ ] A.to reachB.re

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While the book on the top shelf, you need to be very careful. [ ] A.to reachB.re

While ________ the book on the top shelf, you need to be very careful.

[]

A.to reachB.reachingC.reachD.reached

试题答案

答案:B