题目列表(包括答案和解析)
A new technique ____ out, the yields (收成) increased by 20% .
A. having working B. having been working
C. has worked D. had been worked
A new technique ____ out, the yields (收成) increased by 20% .
A. having working B. having been working
C. has worked D. had been worked
A new technique ____ out, the yields (收成) increased by 20% .
A. having working B. having been working
C. has worked D. had been worked
A new technique ____ out, the yields (收成) increased by 20% .
A. having working B. having been working
C. has worked D. had been worked
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