问题补充：
单选题AsurveysuggeststhattheroyalweddingofPrinceWilliamandKateMiddleton_____agreatboostforBritisheconomybecausealargenumberofvisitorsareexpectedtogo.A.will beB.has beenC.wasD.be
答案：
A解析本题考查时态。根据宾语从句中because a large number of visitors are expected to go从句用一般现在时，故主句用将来时态。选A。
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