何首乌具有的功效是

A．补益精血

B．润肠通便

C．解毒

D．截疟

E．活血

“Would you have told him the answer had it been possible?”

“I would have, but I ＿＿＿＿so busy then.”

A．had been

B．were

C．was

D．would be