当前位置：在线题库搜索＞[单选题]He has done some ______ on that subject from various angles over the past ten years的答案是什么？
问题：
[单选题]He has done some ______ on that subject from various angles over the past ten years
A、esearch
B、research
C、esearches
D、he researches
参考答案：
A
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