The twins ____ Canada for three weeks. A.has been to B.have been to C.have gone toD. have been in

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The twins ____ Canada for three weeks. A.has been to B.have been to C.have gone toD. have been in
The twins ____ Canada for three weeks. A.has been to B.have been to C.have gone to
D. have been in

The twins ____ Canada for three weeks. A.has been to B.have been to C.have gone toD. have been in
D对,
因为主语是复数,排除A,而B与C 不能与FOR 短语连用.
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D

have gone to已经去某地,不能加一段时间

have been to是曾经去过,一般已经回来了