Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet.

A．has been tried; hasn’t

B．has tried; haven’t

C．have tried; haven’t

D．have been tried; hasn’t

下列治法中，不属于《素问·阴阳应象大论》所述因势利导治疗原则的是（）

A.阴病治阳，阳病治阴

B.其下者，引而竭之

C.因其重而减之

D.其在皮者，汗而发之

E.其高者，因而越之