What worried the mother most was __________ the Internet after class in this schoolA.her son’s not forbidding surfingB.her son’s not being forbidden to surfC.her son’s being not forbidden to surfD.her son’s having not forbidden surfing
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B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。