How long do u suppose it is ____ he arrived and began to wor

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How long do u suppose it is ____ he arrived and began to work here
A before
B when
C after
D since

D
考查非延续性动词的使用.
去除插入语do you suppose.
How long is it since he arrived and began to work here?
就是对：It's +时间+since+一般过去时从句.对【时间】提问.
再问：那为什么不可以用 after 呢
再答：这句型本身就是这样的。另外，since强调到【现在】为止，而after就有可能到【过去】为止。
再问：呃，这样哒那可以举一个用 after 表【到过去为止】的句子吗谢谢

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