长难句结构分析 — 英语词汇题
题目
请在下列长难句的空格处填入最恰当的连接成分，使句子语法完整、逻辑通顺。
"The researchers concluded that ______ numerous obstacles had delayed the project, its final outcomes were, by any reasonable standard, remarkably successful."
A. even though
B. because
C. so that
D. in case