问题补充:
—How long do you think it is he arrived here?
—No more than half a year, I believe.
A. when
B. that
C. before
D. since
答案:
A. when
B. that
C. before
(答案→)D. since
解析:与下文的答语相连,完整结构是“从他来之后有半年了”。
【标签】现在完成时的时间状语
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