It is impossible for us to carry the stone statues, all of are too heavy.
A. which
B. them
C. those
D. what
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(答案→)A. which
B. them
C. those
D. what
解析：考查定语从句。本题定语从句的先行词是the stone statues, which指代先行词在句中作为of的宾语。句意：对我们来说携带这些石像是不可能的，所有的石像都太重了。BCD三项都不能引导定语从句。