We were about to go outing it began to snow heavily.A. whenB. whileC. asD. until

发布时间：2020-08-16 13:47:12

We were about to go outing     it began to snow heavily.    
A. when
B. while
C. as
D. until

网友回答

(答案→)A. when
B. while
C. as
D. until
解析：考查固定搭配。Be about to do sth when…  “刚要…这时”.。句意：我们刚要外出这时天开始下雪。
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