问题
选择题
Nobody believed his reason for being absent from class__________he had to meet his uncle at the airport.
A．why
B．that
C．where
D．because
答案
B。
that在此引导同位语从句，修饰名词his reason。此题的难点是，his reason后带有用作定语的介词短语for being absent from class，如果撇开这个介词短语，问题就变得简单了。