My parents have promised to come to see me before I _________ for Africa.
A．have leftB．leaveC．leftD．will leave
B
考察時(shí)態(tài)。本題before后面仍然是一個(gè)時(shí)間狀語從句，根據(jù)句意：我的父母答應(yīng)在我去非洲之前來看我。用一般現(xiàn)在時(shí)代替將來時(shí)。
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