摘要：27．B of which结构可以和定语从句的主语形成比例关系.
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That tree, the branches ________ are almost bare, is a very old one．
[ ]
A．
whose
B．
of which
C．
in which
D．
on which
The growing speed of a plant is influenced by a number of factors， are beyond our control.
A.most of them B.most of which? C.most of what D.most of that
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There are 800 students in our school, _____are girls.
A. 50% of then B. 50% of which
C. 50% of whom D. 50% of the students
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