问题描述：
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
a.teach/have taught
b.have taught/teach
c.will teach/will teach
d.have taught/will teach
选项及原因
问题解答：
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