After that they had ---sleep.A.a night good B.a night's good

After that they had ___sleep.A.a night good B.a night's good C.a good night D.a good night's
After a long journey they had a _____.
A.a good sleep of night B.a good sleep night C.a good night sleep D.a good night's sleep
这两道题意思差不多,但是它们的答案却不同,第一个题选C第二个题选D