问题
选择题
He worked late into the night yesterday. That’s ___ he couldn't get up on time this morning
A．how
B．why
C．what
D．when
答案
答案：B
这是以why引导的表语从句.意为:那就是今天早上他为什么不能按时起床的原因.
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He worked late into the night yesterday. That’s ___ he couldn't get up on time this morning
A．how
B．why
C．what
D．when
答案：B
这是以why引导的表语从句.意为:那就是今天早上他为什么不能按时起床的原因.