What I worried about was ______.A、them not having studied wellB、they had not st

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问题 What I worried about was ______.

选项 A、them not having studied well
B、they had not studied well
C、their not having studied well
D、their not studied well

答案 C

解析作表语应用动名词的形式，故先排除B和D，除动名词作宾语的情况外，其复合结构应使用物主代词，前者可用宾格来作复合结构。

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