They said that many problems had been solved.
他们说，在这样的水平上，下面这些问题都解决了。
For most of the past century it was assumed that the problem had been solved.
在上世纪大多数的时间里，人们以为这一问题已经得到了解决。
The difficult problem had not been solved.
这个难题还没有得到解答。
If he had come yesterday evening, the question might have been solved.
昨晚如果他来了，问题也许已得到解决。
If the problem had been less complicated, it would have easily been solved.
如果问题不是很复杂的话，那么就很容易解决了。
He had been chipping away at the problem util it was solved completely.
他一直在琢磨这个问题，直到把它完全解决为止。
He had been chipping away at the problem util it was solved completely.
他一直在琢磨这个问题，直到把它完全解决为止。
应用推荐