1.C動詞不定式做定語,至于你講的兩者間沒啥區(qū)別,就是前者限定了物,而后者沒任何限定,就像 I don't know what to buy. I don't know which pen to buy .是一樣的.2.C 根據(jù)你的補充問題,我對答案簡單講一下你就理解....（）good time they are having now! ()great fun it is !A what ,what aB what a ,what Chow ,whatD how a , what a .要講解為什么答案是B，那時間time是不可數(shù)的呀，為什么用了what a ？你好！不好意思，今天太忙了！time: 單數(shù)名詞(相當長的)一段時間(前面可加a,但無復數(shù)情況）如：He stayed for quite a time...他呆了相當長的一段時間。After a time they came to a pond.過了好久，他們來到一個池塘。故在感嘆句中有a.