To make your DIY work perfect, you'd bet...

To make your DIY work perfect, you'd better not start ________ you get all the tools ready.

A.when B.since C.before D.after

C 【解析】考查从属连词词义辨析。句意为：为了让你自己的手工制作品完美，你最好不要在准备好所有工具________开始。when当……时；since 自从；before在……之前；after 在……之后。分析句意并结合常识可知此处表示"不要在准备好所有东西之前开始"。故选C。

考点分析：

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