【C18】
A．because
B．while
C．when
D．if
请帮忙给出正确答案和分析，谢谢！
【C18】A．BecauseB．IfC．AlthoughD．Unless
A．becauseB．sinceC．whenD．for
【C5】A．beforeB．whileC．whenD．after
【C12】A．becauseB．whileC．althoughD．so
【C2】A．BecauseB．WhileC．AfterD．When
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