____to go for a walk.it began to rain怎么不选when preparing而选as we were preparing

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____to go for a walk.it began to rain怎么不选when preparing而选as we were preparing

____to go for a walk.it began to rain怎么不选when preparing而选as we were preparing
____to go for a walk.it began to rain
怎么不选when preparing而选as we were preparing

____to go for a walk.it began to rain怎么不选when preparing而选as we were preparing
因为后面的主语是it而前面的准备的主语必须是人,两个主语不一致不能省略用非谓语的,所以原答案正确

前后主语不一样,如果选了when preparing,就是主语一样了,而这有不符题意。