[題目] 過去簡單式與完成式如何選

[wayneHsu (Wayne)]

書名：Toeic official guide
版本：IV
頁數：p.57 151
題目：
        Dixon has a smaller production plant in Cardiff,Wales,where a similar
project commenced early last year. the work at Cardiff ____  within seven mont
hs.

        (A)     has been completed
        (C).    was completed

疑問：為甚麼是C而不是A


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推 Nakata0911  : within 是某段時間之內特定時間點  用過去簡單式
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