填空题

Only after they had performed hundreds of experiments did they succeed in(solve)______ the problem.

【参考答案】

正确答案：solving

<上一题目录下一题>

热门试题

填空题

I tried to fix the computer myself, but has just made it(bad)______than I had expected.

填空题

At the meeting I made some proposals, but no one seemed to be(interest)______in them.