A．becauseB．althoughC．unlessD．so

【C10】A．DespiteB．AlthoughC．IfD．So

【C17】A．WhileB．AlthoughC．SinceD．So

【C12】A．becauseB．whileC．althoughD．so

_____it started to rain, 1 still want to go to the Beihai Park.A. BecauseB. AlthoughC. A

______it is long after dark, he is still wearing black sunglasses.A．IfB．AlthoughC．UnlessD．

【C2】A．so thatB．becauseC．unlessD．though