Scientists have found that there are four levels of sleep, each ______ a little

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

选项 A、is
B、was
C、being
D、to be

答案 C

解析该题考查考生对独立结构的掌握。being a little deeper then the one before在这里对前面的陈述提供进一步的信息。

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