问题
选择题
The reason ____ he explained to us was ____he overslept.
A．why; that
B．why; because
C．that; because
D．which; that
答案
答案：D
考查定语从句及固定句型。Which 指代先行词the reason,在定语从句中做explain的宾语。第二空是一个句型The reason is that…原因是…;句意：他向我们解释的原因是他睡过头了。