Around 3 billion years ago,_________ life on the earth began in___________ deep blue seaa.

问题描述:

Around 3 billion years ago,_________ life on the earth began in___________ deep blue seaa.
A the / X B a / the C x /the D a / x
为什么选C,请分析一下,

life在这表示生命,并不需要特指.deep blue sea指深海,不是特指,但一般加定冠词the.