What worried the mother most was the Internet after class in this school.A. her son’s not

问题补充：

What worried the mother most was the Internet after class in this school.

A. her son’s not forbidding surfing

B. her son’s not being forbidden to surf

C. her son’s being not forbidden to surf

D. her son’s having not forbidden surfing

答案：

A. her son’s not forbidding surfing

(答案→)B. her son’s not being forbidden to surf

C. her son’s being not forbidden to surf

D. her son’s having not forbidden surfing

解析：：考查动名词的复合结构和动词用法。动名词的否定式是在动名词前面加not，所有格是在前面加形容词行物主动词。Forbid sb to do sth禁止某人做某事，本题考查了被动形式。句意：最让这位母亲担心的是她的儿子在学校下课以后没有被禁止去网吧。故B正确。