单选题____AwhatBwhichCitDthem
单选题
____
A
what
B
which
C
it
D
them
参考解析
解析：
只有which可用与非限定性定语从句，来代表前边的先行词，其余三项均不可。
只有which可用与非限定性定语从句，来代表前边的先行词，其余三项均不可。
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