作业帮____some mammals came to live in the sea is not known.能用which吗
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____some mammals came to live in the sea is not known.能用which吗
____some mammals came to live in the sea is not known.能用which吗
____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.
不能。
用why
这里用which 无法解释的通 which是指哪一个 这里主语已经在句首明确some animals
希望对你有帮助哦~
that。。。。。。。。。