-- By the end of last month,Bruce _______ here for four year

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-- By the end of last month,Bruce _______ here for four years.
-- No wonder he can speak Chinese so well.
A.worked
B.has worked
C.had worked
D.has been working
我知道是用完成时,但为什么选C不选B?

题中Bruce是在上个月末为止,上个月是过去的时间,而Bruce的动作一直持续到过去时间,属于过去的过去,故用过去完成时.若题目将时间改为现在now,则可以选择B选项.

-- By the end of last month,Bruce _______ here for four year By the end of last month中的by是什么意思? By the end of last month,he ___ in the club for wtwo years By the end of last month,they _____________(结婚)for 50 years. I have been studying here for four years; by the end of next by the end of last month 上个月末? by the end of last month ,they___(build)five bridge By the end of last year we ___ each other for ten years. By the end of last year we________(know)each other for ten y By the end of last year the railway___. By the end of last year he______about 1500 English words. By the end of last year,another new subway__in shanghai.