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:考查固定短语。句意:自他到这儿以来,你认为多久啊?故用since。
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