The creators of Google have prom

The creators of Google have promised to give Google, org about one percent of company profits and one percent of its total stock value every year. Aleem Walji says this amount may increase in the future.
It has been noted that the sale of mobile phones has also increased recently. According to a blog post 21_____ smart phone, sales between July and September in 2010 22_____ to 4.7 million units, which is a plus of 270% when compared 23_____ the sales between April andJune in 2010.
24_____, the next shift from e-commerce to m-commerce is inevitable. 25_____ commerce is still an emerging channel, 26_____, with less than 4 in 10, UK consumers having tried it in September 2009 , 27_____ Allied Trade Group, Inc.
This dimension of e-transactions for 28_____ business offers global opportunities and challenges. With the sophistication in the software and CMS 29_____ to develop online stores and integrate secure mode of payments, 30_____ an e-commerce site is becoming simpler day by day and cost effective.
26.
A、however
B、therefore
C、but
D、although
【正确答案】：A