28. I _____ this for over 30 years before I retired in 2020.
(A) have did
(B) had doing
(C) have done
(D) had been doing

答案：登入後查看
統計： A(12), B(31), C(126), D(234), E(0) #2888116

詳解 (共 1 筆)

#5399989
已經在2020退休可知直到過去以前，已持...
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