Where is ()maths teacher?He's talking with Sam'father.A.a B.an C.the D.不填
问题描述：
Where is ()maths teacher?He's talking with Sam'father.A.a B.an C.the D.不填
答
选C.此处特指某个老师,用定冠词the.
意思是：-数学老师在哪?-他正在和Sam的父亲谈话.