（届四川省成都树德中学高三3月阶段性考试英语试卷）
Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too.
| A．though | B．however | C．since | D．even if |
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（届四川省成都树德中学高三3月阶段性考试英语试卷）
Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too.
| A．though | B．however | C．since | D．even if |
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