I was about to leave home _____ suddenly it began to snow.

A. when
B. while
C. as
D. as soon as
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科目：高中英語 來源：0127 期末題 題型：單選題

I was about to leave home _____ suddenly it began to snow.
[     ]
A. when
B. while
C. as
D. as soon as

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