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he has a hard time work out the math
Hehasahardtimetheproblem.A.worksoutB.workingoutC.workoutD.worksout...
He has a hard time the problem. A.works out B.working out C.work out D.works out
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B 表示在某事上很费力,可用have a hard time (in)doing sth,故本题选B。
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