he thought he was helping us with the work he was actually in the way.A. AlthoughB. Unles

问题补充：

he thought he was helping us with the work, he was actually in the way.

A. Although

B. Unless

C. Because

D. When

答案：

A. Although

B. Unless

C. Because

D. When

解析：主从句之间存在着转折关系。虽然他认为他在帮忙，实际上他却是妨碍我们的工作。故选A。