____some mammals came to live in the sea is not known.能用whic

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/06/06 11:32:00

____some mammals came to live in the sea is not known.能用which吗

不能,因为which 一般在句中会做某一个成分,即没有Which 句子不完整,而本句不看空白处,some mammals came to live in the sea is not known是一个相当完整的句子,主语是some mammals came to live in the sea .is not known 是系表结构,即is 是系动词 not know 是表语
应该用whether
whether some mammals came to live in the sea is not known.是否有哺乳动物开始生活在海里还不知道.

____some mammals came to live in the sea is not known.能用whic ___D__ some mammals came to live in the sea is not known.[ ] how some mammals came to live in the sea is not known, __________ some medals came to live in the sea is not known. （共40题、总分40分）1.( ) some mammals came to live in the sea is no It is the largest mammals in the word that live on land.It l a good sailor is not known when the sea is clam and water is The house is not big enough _____.A to live B to live in C f ----------it is to swim in the sea you can not imagine what fun it is to swim in the sea with m We may not know how to use the telephone in the country whic man is not at home deep in the sea.