题目
Our teachers have been with us for nearly three years ________ we came to junior high school. We should thank them for what they have done for us.
A．until B．before C．since D．when
A．until B．before C．since D．when
A.
until
B.
before
C.
since
D.
when
知识点：专题08 单项选择专练100题（二）（人教版）章节：专题08 单项选择专练100题（二）（人教版）