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【题目】The findings support another study which showed that being happy ______ reduce the risk of heart disease.
A.need
B.shall
C.must
D.can

【答案】D
【解析】考查情态动词。句意:这个发现支持了另一项研究:快乐可以降低心脏病的风险。Need需要;shall将,会;must必须;can可能,可以;根据句意,选D项。

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