【C5】
A．whereas
B．however
C．nevertheless
D．since
请帮忙给出正确答案和分析，谢谢！
【C11】A．whereasB．whereinC．whereonD．wherefore
【C5】A．andB．howeverC．soD．therefore
【C5】A．untilB．onceC．afterD．since
【C5】A．neverB．yetC．alreadyD．since
A．whereasB．otherwiseC．althoughD．while
【C5】A．ThereforeB．HoweverC．ThenD．Moreover
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