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

游客2024-01-20 7

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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