给出的都是将正确选项代入之后的句子：
1) In the past few years, the number of convicted criminals given community service sentences allowing them to remain unconfined while performing specific jobs that benefit the public has risen dramatically.
这里可不可以用“，”将allowing…… public隔开，变成插入语，修饰sentence呢？即：
the number ……sentences, allowing them ……the public, has risen dramatically.
会不会造成allowing是伴随动作的歧义呢？ --ing作定语是不是只需要从动作是否是主动的，这一点来考虑？
2) A prolific architect who worked from the turn of the century until the late 1950's, Julia Morgan designed nearly 800 buildings in California, perhaps most notably WRH's monumental estate at San Simeon.
此处“perhaps …… at SS”在句中作什么成分呢？ 好像不太符合独立主格的一般形式阿 | 
