31.______ should be made with great care.A. So useful an experime_英语解答

31.______ should be made with great care.
A. So useful an experiment
B. So useful experiment
C. Such useful experiment
D. Such an useful experiment

人气：250 ℃　时间：2020-04-18 03:15:52

解答

with great care.意思是小心翼翼的
选择D 意思是他小心翼翼完成了一次很有用的经验