问题描述：
TESTNINE 18.this is the refrigerator we have had so much trouble
TESTNINE
18.this is the refrigerator we have had so much trouble
A)with which
B)of which
C)at which
D)to which
TESTNINE
18.this is the refrigerator we have had so much trouble
A)with which
B)of which
C)at which
D)to which
问题解答：
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