Delivery is delayed___________ a strike has temporarily closed o

Delivery is delayed___________ a strike has temporarily closed our factory.
A、although
B、even though
C、because
D、because of
【正确答案】：C
【题目解析】：although意为“虽然”；even though意为“即使”；because意为“因为”；because of意为因为“，其后只能接短语，不能接句子。根据句意由于罢工暂时关闭了我们的工厂，所以交货延迟了，故选C。