I wonder how many years ago _____.
A. did your father retire
B. your father retired
C. has your father retired
D. your father has retired
A. did your father retire
B. your father retired
C. has your father retired
D. your father has retired
【答案】
A. did your father retire
B. your father retired
C. has your father retired
D. your father has retired
A. did your father retire
B. your father retired
C. has your father retired
D. your father has retired
【答案】
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