【C6】A．AndB．HoweverC．ThereforeD．So

【C20】A．moreoverB．howeverC．thereforeD．furthermore

【C5】A．andB．howeverC．soD．therefore

【C2】A．moreoverB．howeverC．thereforeD．nevertheless

【C20】A．MoreoverB．HoweverC．ThereforeD．Whereas

【C6】A．besidesB．howeverC．thereforeD．undoubtedly

【C3】A．FurthermoreB．HoweverC．ThereforeD．Nevertheless