2. 外语
  3. The Johnsons must have been out, ___there is no light which can be seen in their house tonight.

The Johnsons must have been out, ___there is no light which can be seen in their house tonight.

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问题 The Johnsons must have been out, ___there is no light which can be seen in their house tonight.
选项 A、for
B、because
C、since
D、as
答案A
解析 because表示直接的因果关系，一般用于同答由why引导的问句。since意为“既然，由于”。for也表示原因，但引导的是并列句，表示补充说明的原因。as用作从属连词时表示某人做某事的理由，或者说明某种状态存在的理由。根据上下文判断，两句之间为并列关系，后句补充说明前句。故选A项。
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