题目内容：

it will be the first time i__the subject.don`t worry.it will a bit difficult the first time you__i
a.teach/have taught
b.have taught/teach
c.will teach/will teach
d.have taught/will teach
选项及原因

优质解答

选择B第一个应该填have taught,因为是固定句型：it will be the first time that+完成时态所以teach的完成时态是have taught第二个应该填teach,这个句子要补充的是一个定语从句,主句是将来时,从句应该用一般时代替将...