几道英语语法习题求分析原因

题目

几道英语语法习题求分析原因
The principal made the official announcement in front of a crowd _____ organizers estimated at more than 1,000.
A.in which B.of which C.that D.whose
Getting an internship in the first place often depends on deep pockets and parental connections ______ only the more fortunate youngsters have access.
A.in which B.to which C.by which D.of which
On average ,84% of university graduates were in work in 2009 ,the latest year _____ date are available.
A.with which B.to which C.for which D.on which

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