单选题
They were just going out ______ it began to rain.
A、
when
B、
as
C、
while
D、
and
【正确答案】
A
【答案解析】
[解答] just在句中意为“正好、恰好”,when等于at that time。just...when...可理解为“正要……就……;刚要……就……”,例如:We were just leaving when he came in.(他进来时我们正要走)。
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