They didn't know _____their holiday?

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They didn't know _____their holiday?
A,how they can spend
B,how could they spend
C,how to spend
D,how they will
要说明原因噢,为什么?B怎么不对

这是宾语从句,要注意连接词、时态、语序三要素.
因为主句是didn't know过去时,所以宾语从句要用过去的时态,AD 不正确
B could they 这个语序是疑问语序,如果改成 they could 就对了
C 是不定式短语,可以放在疑问词后面使用

They didn't know _____their holiday? 【英语】They don't know _____their parents are.A.that B.what C.w didn't they know the apponited time i didn't know they would go to Japan they even didn't know who you were.how______they I didn’t know how would they go to london. They didn't know who___it Adesign Bis designing Cdesigned Dw 1 They didn't know why she _____ the glasses . 改错：They didn't know where the mouse from. I didn't know when they （） for beijing They didn't know Spanish,and the waiter____know English newcomers walked round and round.They didn't know _______