Mr. Green is said an experiment to prove the new method of solving the problem when young.
A. to do
B. to have done
C. to be doing
D. to have been doing
Mr. Green is said an experiment to prove the new method of solving the problem when youn
答案:2 悬赏:70 手机版
解决时间 2021-12-25 20:38
- 提问者网友：黑米和小志
- 2021-12-25 04:51
最佳答案
- 五星知识达人网友：孤独的牧羊人
- 2021-12-25 06:26
A. to do (答案→)B. to have doneC. to be doing D. to have been doing解析：由when young可知此处应该用不定式的完成式。
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- 1楼网友：酒安江南
- 2021-12-25 07:58
谢谢解答
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