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How long is it_____ I _____?

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How long is it_____ I _____?
A.since…arrived
B.since…has
arrived
C.when…arrived
D.as…arrived
How long is it_____ I _____?
A吧How long is it since I arrived?
如果用B,就应该是I have arrived,而不是has arrived
如果用C,句意不通,when是一个时间点,不是多长时间
如果用D,as I arrived,也是我到达了