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--- You are so lucky.

---What do you mean          that?

A. for                B. in

C. of                D. by

---You are so lucky.             

---What do you mean ____that?

A. for　　                      B. in　　          C. of　　              D. by

---You are so lucky.             

---What do you mean ____that?

A. for　　                      B. in　　          C. of　　              D. by

---You are so lucky.             

---What do you mean ____that?

A. for　　                      B. in　　          C. of　　              D. by

---You are so lucky.             

---What do you mean ____that?

A. for　　                      B. in　　          C. of　　              D. by