问题补充:
---How long do you think it is he took up the job?
--- Half a year at least.
A. when
B. before
C. that
D. since
答案:
A. when
B. before
C. that
(答案→)D. since
解析:句型:it is+段时间+ since“自从他干这项工作多长时间了?”“至少半年了”
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