收购人持有、控制一个上市公司的股份超过公司已发行股份的30%时，继续增持股份或者增加控制的，应当以要约收购方式向公司的所有股东发出收购其所持有的全部股份的要约。( )

______, the new electronic device they designed is now in regular operation.

A．With the solved problem

B．With this problem being solved

C．With the problem solved

D．With this problem to solve