问题
选择题
It was not until Mum agreed to buy him a computer, _______ was his favorite, _______ the boy promised to study hard.
A．that; that
B．which; that
C．that; which
D．which; which
答案
答案：B
题目分析：考查强调句型和定语从句。第一空which指代computer 在句中作主语；第二空that与 it was构成强调句型。故B正确。句意：直到妈妈同意给他买他最喜欢的电脑的时候，那个男孩答应认真学习。
点评：强调句型的关键在于找准被强调的成分；定语从句的解题关键在于分析句子成分。