As usual, I went to work on foot that day                  it was raining heavily.

so that

as though

in case

even though

考查连词短语辨析。句意：尽管那天下着大雨，我还是像往常一样步行去上班。A. so that 以便；  B. as though 似乎；  C. in case 以防；  D. even though 尽管。根据“As usual, I went to work on foot that day”和“it was raining heavily”可知，前后构成让步关系，应用even though引导让步状语从句。故选D。