问题
选择题
The reason she can finish the homework ahead of time is she is both clever and hard-working.
A．why;why
B．why;that
C．that;because
D．for;because
答案
答案：B
第一个空为why引导的定语从句，第二个空为由 that引导的表语从句，that在从句中不充当任何句子成分。