-How long do you think it is _____ he arrived here?.
-How long do you think it is _____ he arrived here?.
-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
请问是选B,表示强调,“他到底是来了多久了”吗?如果不是那选什么为什么?
那选别的,