We have participated in several ______ with the new biological agents and have seen some amazing results.
A.
advance
B.
treatment
C.
trials
D.
branches
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参考答案:
举一反三
【单选题】听力原文: On Feb 15th, 1989, an instant survey was carried out among 18 overseas postgraduate students. Eleven students were male and seven were female. The purpose of the survey was to discover the views...