求解答——How long do you suppose it is___ he arrived here?——No more than half a weekA since B before C after D when 还望给出详情

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• "How long do you suppose it is _____ he arrived here?"“How long do you suppose it is _____ he arrived here?”“No more than half a week.”A.when B.before C.after D.sincewhich one/ why?
• 求解答——How long do you suppose it is___ he arrived here?——No more than half a weekA since B before C after D when 还望给出详情
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