题目内容
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 |
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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| A.how | B.why | C.what | D.when |