I'm sorry to say this, but there seems to be a mistake.
对不起,这儿好像有个错。
I would have gone on the picnic if it hadn't rained.
如果没下雨,我就去野餐了。
Who could have imagined, in the mid 1970s, for example, that by the end of the 20th century, computers would be as common in people's homes as TV sets?