【单选题】
We believe that sales will increase soon; (), production costs will be going up also.
A、so
B、thus
C、on the other hand
D、however
A、so
B、thus
C、on the other hand
D、however
A、Because we are caring the others too much. B、Because it is quite difficult to understand the others. C、Because we believe we are always right. D、Because the others have done something wrong.