What is the cloth useful——?---We can use it ——the dirty floor.A.to:clean B.for:to clean C.for:cleans D.to:cleaning选哪个?能说明每个空的原因吗,好的加多多多多分!

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What is the cloth useful——?---We can use it ——the dirty floor.A.to:clean B.for:to clean C.for:cleans D.to:cleaning选哪个?能说明每个空的原因吗,好的加多多多多分!

What is the cloth useful——?---We can use it ——the dirty floor.A.to:clean B.for:to clean C.for:cleans D.to:cleaning选哪个?能说明每个空的原因吗,好的加多多多多分!
What is the cloth useful——?---We can use it ——the dirty floor.A.to:clean B.for:to clean C.for:cleans D.to:cleaning
选哪个?能说明每个空的原因吗,好的加多多多多分!

What is the cloth useful——?---We can use it ——the dirty floor.A.to:clean B.for:to clean C.for:cleans D.to:cleaning选哪个?能说明每个空的原因吗,好的加多多多多分!
B be useful for 对...有用处
use...to do...用.去做...

选D be useful doing sth

B. 前面一个空 等于for what for 后面跟名词代词, 如果to, 要跟to do
后一个空, 用to do 表目的,作状语。