题目内容：

All the plans _____will be discussed at the meeting are very important.
A that B which C / D what

优质解答

答案选A!
解析：当先行词是不定代词或是被不定代词修饰时,关系代词通常只用that .这里就是这样的情况,先行词 the plans 被不定代词all来修饰,于是选A,that .