Question

3.    different ideas， we are now getting  closer to the answer.

A. Tried out         B. Trying out

C. To try out       D. Having tried out

Answer 1

3.    D考查非谓语动词。try out和句子主语we之间是主谓关系，且先发生，所以用现在分词的完成式。句意：尝试过不同的建议之后，我们现在越来越接近答案了 。