【題目】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】考查情態(tài)動詞。句意：這個發(fā)現(xiàn)支持了另一項研究：快樂可以降低心臟病的風(fēng)險。Need需要;shall將，會;must必須;can可能，可以；根據(jù)句意，選D項。

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