Unfortunately for Paul,he __(break) his leg while he __(ski) last winter.★★★while的时态用法★★★

Unfortunately for Paul,he __(break) his leg while he __(ski) last winter.
★★★while的时态用法★★★

broke, was skiing
一般while后接过去进行时

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broke was skiing 精锐长宁天山英语组

broke ... while he was skiing while时间状语从句中常用进行时态。