The house isn’t comfortable tonight ______our air conditioner is not working.

admin2009-07-17  50

问题 The house isn’t comfortable tonight ______our air conditioner is not working.

选项 A、so
B、because
C、once

答案B

解析 本句前后半句是因果关系,so 是“因此”,once 指“一旦”。
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