A new study has_____that depression in elderly people could result in earlier mortality.

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问题 A new study has_____that depression in elderly people could result in earlier mortality.

选项 A、suggest
B、suggestion
C、suggested
D、suggesting

答案C

解析 have是现在完成时的标志，后面应该使用动词的过去分词形式，因此选择suggested。

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