My parents have promised to come to see me before I ______ for Africa.
A．have leftB．leaveC．leftD．will leave
B

試題分析：句意,我父母已經(jīng)答應在我去非洲之前來看我。before引導的時間狀語從句，表示主句的動作發(fā)生在從句的動作之前。主句用現(xiàn)在完成時態(tài)，從句只能用一般現(xiàn)在時表示將來意義，故選B。
點評：before引導的時間狀語從句，表示主句的動作發(fā)生在從句的動作之前。主句用現(xiàn)在完成時態(tài)，從句只能用一般現(xiàn)在時表示將來意義。
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