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【题目】Helen join in the school choir because she has a sore throat.

A.mustB.can’tC.shouldD.needn’t

【答案】B

【解析】

句意:海伦不能参加学校的合唱团,因为她嗓子疼。

考查情态动词辨析。must必须,强调主观意愿;can’t不能,表示没有能力或不许可;should应该,表建议;needn’t无需,指没有必要。根据后述原因because she has a sore throat. 她嗓子疼,可知不能参加合唱,故选B

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