The central heating system of this office building is down and several workers ______ it right now.

A．had repaired

B．have repaired

C．repaired

D． are repairing

下列太平天国的诸项活动中，能够与当时世界历史潮流同步的是（）

A.颁布《天朝田亩制度》

B.严惩外国侵略者

C.洪仁玕《资政新篇》

D.反对封建统治