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5.I have seen trees,_____ open at sunrise and close at sunse

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5.I have seen trees,_____ open at sunrise and close at sunset.
A.which the leaves B.of which leaves C.whose leaves D.its leaves
6.All _____ is needed is a supply of oil.
A.the thing B.that C.what D.Which
5.I have seen trees,_____ open at sunrise and close at sunse
两道题的考点都是定语从句.5选C,关系代词在定语从句中作定语,先行词是trees,句意:我见过那些树叶在日出之时张开在日落闭合的树木.6选B,此处是关系代词只能用that的特殊情况,因为修饰的先行词是all.其他只能用that的特殊情况有:
先行词为everything,all,little,much等不定代词时;
先行词被all,every,no,any,some,little,much,one修饰时;
先行词被the only,the very,the same,the last修饰时;
先行词被序数词或形容词最高级修饰时;
先行词是be的表语或there be 的主语时;
先行词有人又有物时;
当主句是以who或which开头的特殊疑问句时.(摘自百度百科词条“定语从句”)