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问题: 非谓语(三)4

127.________Mrs.Johnson on my way to the supermarket.
A.It happened to me that I met
B.I happened to meet

128.The experiment is not_______until everything is ready.
A.to be done B.done
如果两个is改成was是不是应该选B?

解答:

127,It happened that 。。。或I happened to do。
128,is表明还没有做,所以不定式表示将来,如果两个is改成was,The experiment would not be done until everything was ready。