1.I still remember ------ this used to be a quiet village.

1.I still remember ______ this used to be a quiet village.A.when B.how C.where D.what 答案是选A,解析说缺了状语,可是为什么一定要用状语呢?直接的主谓宾不行吗?2.I read about it in some book or other,does it matter ____ it wasA．where B．what C．how D．which 这是一个表语从句,缺表语,可为什么不用what?3.He pointed to what seemed like a tree.what可不可以改为which,为什么4.One of the biggest challenges is _______ he believes to e America on the map is perhaps another country.A.what B.that C．that what答案是选C.解析说that是连词,后面连接一个完整句子,可是That is what I want其中 what I want也是一个完整句子为什么前面不用加that?