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be keen on热衷于：Mrs. Miller is very keen on art.米勒太太对艺术很感兴趣。渴望做某事，极想做某事：be keen on doing.../be keen to do...She is very keen on visiting China.She is very keen to visit China.她渴望访问中国。be keen to

1.A test plan is a document that discribes the scope,approach,and schedule of intended testing activities.这里的intended 和 testing 是什么词性呢？为什么 intended是-ed呢解答：intend 本身是动词，过去分词具有形容词特征 所以