He was delighted to receive her letter and started at once to（&n

He was delighted to receive her letter and started at once to（  ）a reply.

complete

comply

compose

comprise

本题考查动词辨析。

complete：完成。comply：遵守。compose：撰写。comprise：构成。分析语境，立刻写回信，所以选择C。

句意：他很高兴收到她的信，立刻开始写回信。