---Mr．Wang,IwonderwhetherIamabletoopenupmyownlabagainstSARS．---Yes．Yo

---Mr．Wang, I wonder whether I am able to open up my own lab against SARS．---Yes．You are old enough ________ your idea．A.to keep to work onB.to try outC.to come up withD.keep trying out

B解析此题中to try out作状语和old enough连用，表示“年龄足够大了，可以……”。try out one’s idea意为“试验自己的想法”；keep后面要跟v．-ing形式，不接不定式；come up with意为“找到解决问题的办法”；D项缺少不定式符号to。

我也是这个答案