既能温中补虚、和里缓急，又可以调和阴阳、柔肝理脾的方剂是
A．理中丸B．小建中汤C．逍遥散D．一贯煎E．柴胡疏肝散
参考答案：B
I decided to concentrate all my efforts _____ the complicated problem. [ ]
A. to solve
B. to be solved
C. on solving
D. in solving
