A(Ever since) the world B(began) nations C(have difficulty) in D(keeping) peace with their neighbors.

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问题 A(Ever since) the world B(began) nations C(have difficulty) in D(keeping) peace with their neighbors.

选项

答案C

解析应改为have had difficulty。因为ever since引导句子的时候，从句用过去时，主句要用现在完成时。

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成人本科学位英语

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A(Ever since) the world B(began) nations C(have difficulty) in D(keeping) peace with their neighbors.

成人本科学位英语

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HistorianstendtotellthesamejokewhentheyaredescribinghistoryeducationinAmerica.It’stheone【C1】______theteachers

RelationsbetweentheUnitedStatesandColombiasufferedformanyyearsbecauseofanincidentinvolvingtheRepublicofPanama

WhenIwaswalkingdownthestreettheotherday,Ihappenedtonoticeasmallbrownleatherwalletlyingonthesidewalk.Ipic

Ifwomenaremercilesslyexploitedyearafteryear,theyhaveonlythemselvestoblame.Becausetheytrembleatthethoughtofb

Weallassociatecolorswithfeelingsandattitudes.Inpoliticsdarkblueoftenmeans"tradition",andredmeans"socialchange

Themanagergaveoneofthesalesgirlsanaccusinglookforher______attitudetowardcustomers.

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