The young member made several proposals, and none of were considered to be practical or acceptable
A. them
B. which
C. theirs
D. what
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(答案→)A. them
B. which
C. theirs
D. what
解析：考查代词：句意：这个年轻的成员提出了几个提议，没有一个被认为是实用的被接受的。因为两句话中间有连词and，所以后面的是简单句，用them代替proposals，这不是定语从句，不能用which，选A。