问题
选择题
The boss believed Tom's reason for being late for work is ______ he had to help his grandma cook.
A．why
B．that
C．where
D．because he
答案
答案：B
考查表语从句。That he had to help his grandma cook是一个表语从句，这个句中结构很完整，that只起引导作用，不充当任何成分。