问题
选择题
His younger sister may already be in high school now, in ________ case this picture book is too childish for her.
A．that
B．which
C．whose
D．what
答案
答案：B
B 考查定语从句。句意：他的妹妹现在可能已经上高中了，那样的话这本图画书对她来说太幼稚了。在定语从句中，有时为了表达的意思更清楚，可用“which＋名词”引导定语从句，本句中为更清楚地表达“在他妹妹已经上高中的那种情况下”，故用in which case。