【题目】The reason ________I was late for the school was ________I was held up by traffic jam in the morning.
A.why；because
B.that；that
C.that；because
D.why；that

【答案】D
【解析】the reason后跟定语从句时，用why引导，表语从句用that引导，构成“The reason why...is that...”句型。