how long do you think it is _____he arrived here?a.before b.since

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how long do you think it is _____he arrived here?a.before b.since

how long do you think it is _____he arrived here?a.before b.since
how long do you think it is _____he arrived here?
a.before
b.since

how long do you think it is _____he arrived here?a.before b.since
A和B完全两个不同的意思,A是说他要多久才能来,B是说他到这里已经有多久了,因为arrive是过去式,所以肯定是在这之前发生的,只能用B

A

选B

B

B.他到这多久了,不是他来到这之前多久了

A.