My parents have promised to come to see me before I _______  for Africa. 
A．have leftB．leaveC．leftD．will leave
B
考查動(dòng)詞時(shí)態(tài)。由前句的現(xiàn)在完成時(shí)可以看出leave還沒(méi)有發(fā)生，選B符合語(yǔ)境。
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