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问题: 模拟卷3-25

________ the dream has started, his body relaxes and his eyes
become less active.
A. Although B. Once C. As long as D. Even if
请详细写出解题的过程和思路。

解答:

答案是B。Once在这是一旦的意思而不是曾经的意思。一旦他开始做梦,他的身体就松软了,就二目无神了。