Although we are not sure why we sleep, there is no doubt ______ we need to do so

游客2023-07-14  42

问题 Although we are not sure why we sleep, there is no doubt ______ we need to do so.

选项 A、whether
B、why
C、what
D、that

答案 D

解析 尽管我们不确定睡觉的原因,但毫无疑问我们需要这样做。There is no doubt that…为固定句型,意为“毫无疑问……”。
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