问题
选择题
I’m fine — I just felt a bit sleepy and tired, that was ________ I went to bed so early."
A．because
B．when
C．that
D．why
答案
答案：D
考察表语从句.句意,我很好——我只感到有点困和累，那是为什么我这么早睡觉的原因。可知前文为下文的原因，故选D。
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