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Once , this book will be popular. [ ] A.is printingB.is printed C.being printedD

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Once , this book will be popular. [ ] A.is printingB.is printed C.being printedD

Once ________, this book will be popular.

[]

A.is printingB.is printedC.being printedD.printed

试题答案

答案:D

解析:

这是一个含有时间状语从句的主从复合句,once引导的从句是一个省略句,原句为it is printed,省略了it is。