Mr Smith has gone to American 10years ago and has been there since then.A.has gone;since then B.went;from thenC.has gone;since ever D.came;ever since

Mr Smith has gone to American 10years ago and has been there since then.A.has gone;since then B.went;from thenC.has gone;since ever D.came;ever since
Mr Smith has gone to American 10years ago and has been there since then.
A.has gone;since then B.went;from then
C.has gone;since ever D.came;ever since

Mr Smith has gone to American 10years ago and has been there since then.A.has gone;since then B.went;from thenC.has gone;since ever D.came;ever since
这题可以用排除法来做
B中,用went 是可以的,但是from then没有这样的用法,可以用from then on.
C中,since ever是完全错误的,应该是ever since,从那以后
D中,后面句子中there表示,前面要用go ,假如用come的话,后面应该是here
所以A是正确的.
史密斯先生10年前就去美国了,并且从那时候开始一直呆在那儿.

应该用过去时went to