2. 外语
  3. He must have been ill at home, ______he was absent in class this morning.

He must have been ill at home, ______he was absent in class this morning.

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问题 He must have been ill at home, ______he was absent in class this morning.
选项 A、because
B、since
C、for
D、as if
答案C
解析 because／since／for都引导原因状语从句。
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