Cathy had quit her job when her son was born _______ she could stay home and raise her family.

A．now that

B．as if

C．only if

D．so that

阅读《欣赏生命》，回答问题。

课文题目为“欣赏生命”，可作者花大量的笔墨写对生命的思考，这是为什么？

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