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问题: 英语题

The only system I konw( ) will help you remember( )you have heard at a lecture is the system of keeping notes.
A.what;that B.which;what C.what;what
D.that;which

解答:

选B.
I konw可以看做是插入语,后面的will help you remember是一个定语从句,要用关系代词连接。再后面是一个宾语从句,作remember,这个宾语从句中heard 也缺少宾语,所以用代词what。