题目内容

Scientists have found that there are four levels of sleep, each _____ a little deeper than the one before.

A. is
B. was
C. being
D. to be

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A. She wants to exercise before she runs.
B. It's too hot to go running.
C. Her jogging suit isn't warm enough.
D. She already went jogging.

A. were
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B. neither the police did
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A. Why bother They'll have food there.
But it's still early.
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D. But you already had afternoon tea.