My parents have promised to come to see me before I ____for Africa.
A．have leftB．leaveC．leftD．will leave
A
考查時(shí)態(tài).句意:我的父母許諾在我動(dòng)身去非洲前來看我.可知從句描述的是在某個(gè)時(shí)間點(diǎn)前完成的動(dòng)作,故用完成時(shí)態(tài),選A.
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