This is the very knife I used to cut apples yesterday.
A. that
B. by which
C. which
D. with which
网友回答
A. that
B. by which
C. which
(答案→)D. with which
解析：考查定语从句中关系词的使用。句中的used to并非“过去常常”的意思，因为后面有yesterday，因此排除D，所以used后面应该有宾语，关系词应该是个代词，又因为先行词中有the very来修饰，排除C。