cleaning the doghouse was the last thing I wanted to do, I did it with all my efforts.
A. Although
B. As
C. As long as
D. Now that
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(答案→)A. Although
B. As
C. As long as
D. Now that
解析：考查连词：句意：虽然打扫狗舍是我最不想做的事情，但我还是努力去做。A. Although虽然， B. As因为，当…时候，按照，C. As long as 只要，D. Now that既然，两句话是转折关系，用although连接让步状语从句，as也可以表示转折，但是要用于倒装句，所以选A。