Egypt,a country in Africa,--- for its pyramids. A is well-know Bwhich is famous

A.但答案有个打字错误。应该是is well-known。

用A是一句完整的话，用B则句子不完整，因为which is famous是一个定语从句，修饰Egypt，相当于Egypt的定语。这样整个句子还是缺少谓语。

而is well-known是动词+形容词作谓语，句子就完整了。

应选B

be famous for “因……而有名”，which是引导一个从句。

B

应选B。be famous for “因......而闻名” which是引导一个从句。