It's nice to see you again. We  _____  each other since 2014.
A. won't see     B. don't see    C. haven't seen    D. didn't see

解析：
現(xiàn)在完成時(shí)，表示過去發(fā)生或已經(jīng)完成的動作對現(xiàn)在造成的影響或結(jié)果，或從過去已經(jīng)開始，持續(xù)到現(xiàn)在的動作或狀態(tài)。根據(jù)It's nice to see you again. 可知已經(jīng)見到了。根據(jù)since 2014，可知從過去已經(jīng)開始，持續(xù)到現(xiàn)在的狀態(tài)，應(yīng)該用現(xiàn)在完成時(shí)。故選擇C

It's nice to see you again. We  _____  each other since 2014.
A. won't see     B. don't see    C. haven't seen    D. didn't see

解析：
現(xiàn)在完成時(shí)，表示過去發(fā)生或已經(jīng)完成的動作對現(xiàn)在造成的影響或結(jié)果，或從過去已經(jīng)開始，持續(xù)到現(xiàn)在的動作或狀態(tài)。根據(jù)It's nice to see you again. 可知已經(jīng)見到了。根據(jù)since 2014，可知從過去已經(jīng)開始，持續(xù)到現(xiàn)在的狀態(tài)，應(yīng)該用現(xiàn)在完成時(shí)。故選擇C