问题
选择题
“Simpler” books are the foundation ______ students build a lifelong habit of reading and further the actual skill of reading for longer and stronger periods of time.
A．which
B．upon which
C．for which
D．in which
答案
答案：B
考查介词加关系代词引导的定语从句。the foundation是先行词，定语从句缺少状语，以……为基础，要用on/upon the foundation结构，所以选B。