It became very cold and started to snow.
它变得非常冷，开始下雪。
I meant to go to the park, but it started to snow.
我本打算去公园的，但是天开始下雪了。
The snow started to thaw as the temperature kept up.
随着气温升高，雪开始融化。
No sooner had we started the exam than it (C. began )to snow.
我们一开始考试天就下雪。
No sooner had we started the exam than it (C. began )to snow.
我们一开始考试天就下雪。
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