They didn't know _____ to do A who B when C what D where

They didn't know _____ to do A who B when C what D where I don't know what _____.A.do B.doing C.did D.to do I don't know _____to do .A.how:B.what:C.when:D.where 可以选什么?请 I don't know _____ A.how to do B.which to do C.what do D.whe 单项选择,3道啊（ ）1.I don't know _____ to do next.A.what B.who C.wh 英语 【单选题】Here's _____ we want to do.A.where B.what C.when D.h He does not know() A when to do B when to do C where to do D Where did Betty Swan go when she didn't know what to do 咋回答 The boy didn't know___.A：what to do it B：what to do C：when t 20. He doesn't know ______ A. when to do B. what to do C. ho I wonder______do next.A.how to B.where to C.what to D.when t we don't know _____?A:what do we do B:what to do C:what do w