.-- His father is a professor and has been teaching in the university for more than twenty

.-- His father is a professor and has been teaching in the university for more than twenty years.
-- .
A. So is his mother
B. So has his mother
C. So his mother does
D. So it is with his mother

A. So is his motherB. So has his motherC. So his mother does(答案→)D. So it is with his mother解析：可联系答.案.网客服索取。

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